According to the American Academy of Pediatrics (AAP), children ages 2 and older can safely wear a mask. The CDC says the exception is anyone (of any age) who cannot easily remove their own mask or who is having trouble breathing. If you have any concerns about your child’s ability to wear a mask safely, or you have specific considerations for choosing the best mask for your child, talk with your pediatrician. We have suggestions on how to help kids get used to wearing masks, as well as safety considerations for choosing a mask.

This guide focuses on readily available, commercially made cloth and disposable face masks with high filtration designed for kids. We tested masks sized for kids ages 2 through 12. Some of our masks may fit kids 4 and over best, but we have guidance for finding good masks for toddlers too. Older kids, especially teenagers, may find that adult-size masks fit them well. You can also read more about the lab testing we commissioned on our picks, among other topics, below.

To learn about how different types and layers of material, as well as filters, can impact a mask’s effectiveness for a child, I spoke with Taher Saif, PhD, a mechanical engineering professor at the University of Illinois at Urbana-Champaign who researches biomechanics and nanomechanics, and who studied various fabrics’ droplet-stopping abilities. I also spoke with Laura Markham, PhD, a parenting expert and psychologist, about ways to encourage children to wear masks. And to find out what pediatricians are recommending, I interviewed American Academy of Pediatrics spokesperson Jennifer Shu, MD, a pediatrician and author. To better understand protection from aerosol spread of the virus that causes COVID-19, I spoke with aerosol expertLinsey Marr, PhD, a civil and environmental engineering professor at Virginia Tech. In addition to reading research studies on face masks, I browsed extensively online for commercially available kids masks, and I spoke with at least 20 other parents about their experiences with masks for children.

This guide builds on the work of Wirecutter senior editor Joanne Chen, who in 2020 and 2021 spent hundreds of hours researching and testing face masks, and commissioned independent lab testing for filtration efficiency performed by researchers at Colorado State University’s Center for Energy Development and Health.

I’m a science writer with a PhD in cell biology from the University of Pittsburgh. My husband is an emergency department nurse, and he’s one of a handful in the country who used special CDC training to suit up in full biohazard personal protective equipment (PPE) to care for a potential Ebola patient. During the COVID-19 pandemic, he led PPE fitting and training at the hospital where he worked in Philadelphia. And he traveled to a coronavirus hot spot as a member of a Federal Disaster Medical Assistance Team to help manage outbreaks. My husband, who regularly wears a surgical mask or an N95 respirator mask, unofficially checked the fit and breathability of each of the kids masks we tested with our then 3- and 6-year-olds.

The ideal mask for kids is “one that a child is willing and able to wear for most of the day, put on and remove correctly, and that she won’t be constantly touching,” said Dr. Jennifer Shu, pediatrician and AAP spokesperson. Additionally, for a kids face mask to be comfortable and effective, it needs to fit properly, be made from multiple layers of a breathable material, and be appealing to kids.

Shape and fit

Fit is one of the most important factors when choosing a mask, said Virginia Tech engineering professor and aerosol expert Linsey Marr. A properly fitting mask should cover the nose and mouth, be secured below the chin, fit snugly against the sides of the face, and allow the child to breathe easily. It should not have gaps at the nose, cheeks, or under the chin.

Cloth masks come in three styles: pleated, cone, and flat. Pleated masks expand to cover the nose and chin, whereas cone-shaped masks are shaped to arch up over the nose, and many extend below the chin. Flat masks are simple rectangles of fabric and are less likely to conform to the face. Masks should fall just below the eyes and go up a bit higher over the nose.

Disposable masks for kids are available in a pleated style, like the surgical masks worn by medical staff (these tend to be cheaper but leave gaps around the face), or in a closer-fitting, cone-shaped or boat-shaped KN95 or KF94.

Some masks have nose-bridge wires, which help the top of the mask contour to the nose. Masks with nose-bridge wires seem to have the most benefit for older children and children with nasal bridges that are higher relative to their upper cheeks; we found that nose-bridge wires didn’t make much of a difference in fit for younger kids (around ages 2 to 6) with smaller noses. A nose-bridge wire may be especially beneficial for kids who wear glasses, if they experience fogging.

As with masks for adults, when it came to kids masks, we found that one size definitely did not fit all. Even brands offering multiple kids sizes weren’t well suited to every tester in the target size. To increase the odds of getting a good fit, look at the dimensions of the mask and compare them to the measurements of your child’s face before you order. But know that even if the dimensions of the mask seem appropriate, the ear loops play a big role in fit. Several of our picks have adjustable ear loops to allow for a comfortable fit for a wide range of face sizes. For safety reasons, we don’t recommend kids masks that wrap around or tie behind the head.

Filtration and other factors

When we began testing for this guide, in summer 2020, few masks were available for kids, and most of them were simply constructed with a few layers of cloth. Since then, many more masks for kids have become available, including those with medical-grade filters. Updated guidance from the CDC places more emphasis on masks with these protective filters. Our current picks—the Enro mask, Happy Masks Pro, WellBefore Kids KN95, and Powecom KN95—all offer robust built-in filtration.

N95 masks are designed to meet US standards, and they can block 95% of particles as small as 0.1 micron in diameter. There are no N95 masks made specifically for kids (and if you see one, it’s counterfeit). Other high-performing medical masks are produced in children’s sizes, including the KN95 (China’s N95 equivalent) and KF94 (Korea’s N95 equivalent). All are made with similar layers of high-filtration, nonwoven materials and can block 94% to 95% of tiny airborne particles.

In addition, some cloth masks come with filters sewn in. In independent lab tests commissioned by Wirecutter (you can read more details below), our cloth picks with incorporated filters, the Enro mask and the Happy Masks Pro, blocked about the same amount of airborne particles as a KN95 mask. Additional research (by Marr and others) has found that cloth masks with incorporated filters improve the mask’s ability to block particles, but that KN95 and KF94 masks still performed better.

There are a few caveats: First, a filter layer was more effective only when it fit the entire expanse of the mask; otherwise, air could get in or out around any areas the filter didn’t cover. (Both Enro and Happy Masks Pro masks have built-in filters that span the entire mask. Cloth masks with filter pockets, which allow you to add an extra fabric layer of disposable filter, tend to be less effective.) And though we sent only comfortable and adjustable cloth masks to be tested, the lab tests also didn’t specifically account for fit or comfort (which Dr. Shu and Marr said should still be a priority in masks for kids). The filtration of Enro and Happy Masks models diminish over time with repeated washing.

Layers and breathability

Generally speaking, the more densely woven the material is, the better it can block particles. However, very densely woven materials, particularly when it comes to reusable masks, can come at the expense of breathability.

Because breathability is important both for comfort and protection, more layers is not necessarily better, said Taher Saif, PhD, a mechanical engineering professor at the University of Illinois at Urbana-Champaign. Adding too many layers of fabric or a filter can force air in and out around the mask (where there are gaps between the mask and your face), instead of through it; this could make the mask less effective overall. A review of 25 studies agreed that “there is a trade-off in that more layers increases the resistance to breathing.” The Happy Masks Pro was the only cloth mask we tested that has more than three layers—including a built-in filter layer—but that still remained breathable, comfortable, and well fitted.

Helping kids wear a mask

Parenting expert and psychologist Laura Markham, whom we interviewed during the height of the pandemic, said that parental attitudes and actions are paramount in getting children to wear masks. “If you always wear one when you are out, they’ll want to wear a mask,” she said. While working on this guide, I discovered that my then 3-year-old especially liked wearing light-blue masks because they reminded him of the surgical masks my husband wears at work: “I look like Daddy,” he said, beaming.

Whether you’re masking while traveling or when you’re sick, explain to your child that wearing a mask is “a way we show that we’re caring for other people,” Markham recommended. And to make it fun, you could say, “We’re superheroes, just like superheroes wear masks, we’re protecting other people.”

It’s important to start small and work up to longer periods, Markham said. If your child is new to wearing a mask, Markham recommends starting in your home. You could perhaps play a game like “guess my emotion”—a twist on charades in which everyone in the family puts on a mask, and then you each take turns acting out an emotion while others guess what it could be. We tried this with my 3- and 6-year-olds, and we had fun using our whole bodies to show feelings like “frustrated,” “excited,” and “bored.” We also tried Bill Nye’s makeshift way to “show” that a mask is working by taking turns trying to blow out a candle while wearing each of the masks we tested.

Dr. Shu suggested that a good time to practice wearing a mask is when a child is doing a quiet activity, like watching videos or listening to a story. These small sessions will give you an opportunity to troubleshoot the mask and find ways to make it comfier (read more in the Making it comfortable section, below). Children should also be encouraged to wash their hands after handling their worn masks in practice sessions. And even if a parent decides on the brand of mask, Markham said it’s valuable to have your child choose the pattern or color so they feel a sense of ownership.

Making it comfortable

Comfort is another important factor when it comes to masks for kids, Marr said, “because if they’re not going to wear it, then there’s no value to it.” You may have to try more than one brand or style of mask before you find the right one for your child. But there are several things you can do to help make masks more comfortable to wear for long periods. To take pressure off the back of the ears, you can add buttons to a hat or headband and attach the ear loops to the buttons. Alternatively, you can make or purchase “ear savers” or “strap extenders,” so the mask secures behind the head. (As we note elsewhere, we didn’t test any masks that tied or fastened behind the head, due to the potential strangulation hazard.)

Kids who wear glasses may find that fogging becomes a problem while they’re wearing a mask; a nose-bridge wire may be valuable because it helps create a closer seal along the top of the mask, limiting exhalations from going up toward the glasses. If the mask you purchase doesn’t have a nose-bridge wire, you can buy stick-on ones. You can also try resting the glasses on top of the mask. Washing glasses with soap and water or an anti-fogging solution may also help.

Wearing a mask for hours can cause skin irritation, chafing, or chapped lips. For chafing, petroleum jelly may do the trick, but there are also mask-specific products that health-care providers use, like Body Glide Face Glide. For more help troubleshooting skin problems, including maskne, the American Academy of Dermatology offers these tips.

What to avoid

Everyone should avoid masks that have “breathing valves,” which are round plastic pieces on one side of a mask that allow exhaled air out, often without passing through all the layers that serve to filter air (you sometimes see these valves on N95 masks, including the ones Wirecutter recommends for wildfire smoke). These types of masks are intended for use when there is debris in the air, like at a construction site or for smoke or pollution. Dr. Shu warned that “masks with exhalation valves are not recommended for prevention of viral transmission since they release particles from the wearer into the air.”

Masks with straps and ties that go around the head or neck pose a safety concern for young children, especially while they’re at play. Dr. Shu and other child-health experts have noted that children need to be able to remove their masks independently. For these reasons, we did not include any masks with ties or elastic that fastened around the head or neck in our testing.

We first tested kids masks beginning in July 2020, when relatively few companies were making face masks for children. We focused on the best options available at that time: cloth masks that had at least two layers, were readily available, could be ordered online, and were specifically sized and designed for children. Kids masks with features like adjustable ear loops, flexible nose-bridge wires, built-in filters, or masks made from breathable performance fabrics were hard to find. We ruled out masks with ties or around-the-head straps, due to concerns about strangulation during play.

We sent masks to six families, with a total of 10 children, ages 2 to 11. Each mask was worn for an extended period to see how well it was tolerated and stayed in place on each child. Parents also reported on fit, fabric, and how the masks stood up to washing.

As the pandemic wore on, companies continued introducing and updating mask designs, making masks for kids that were more breathable, more adjustable, and, in some cases, had built-in filters. In fall and winter 2020, we continued testing masks for kids, eventually trying some 30 models.

In December 2020, April 2021, and August 2021, Wirecutter commissioned an independent lab at Colorado State University’s Center for Energy Development and Health to test how well the masks on our list filtered droplet- and aerosol-sized particles. We sent a total of 39 prewashed adult and kids masks, plus some filter inserts, to the lab. To test for filtration and breathability, the researchers glued the masks down over a hole and pushed particles through a section of the fabric.

The lab test showed that all of our current and former kids-mask picks are effective at catching 5- to 10-micron particles, which are equivalent in size to the largest droplets humans release during breathing and talking, respectively. All the masks were also able to block at least some of the smallest particles tested, down to 0.5 micron. Two cloth masks stood out in the lab test: The Enro and Happy Masks Pro masks have built-in filters and performed about as well as a surgical mask or an N95, blocking about 99% and 94% of 0.5-micron particles, respectively. Other cloth masks, without filters, performed about the same as one another—they filtered up to about 20% of these smallest particles, whether they had two or three layers, or were made with cotton or polyester.

In April 2021 and August 2021, we also sent several N95, KN95, KF94, and other disposable masks (including kids-size ones) for independent lab testing. We found that our picks—the WellBefore Kids KN95 and the Children’s Sized Powecom KN95—filtered as well as a standard N95, blocking about 99.5% of 0.5-micron particles.

It’s important to know that a mask’s filtration ability can be impacted by how you use and care for it. During our August 2021 round of testing, we also evaluated Enro and Happy Masks models that had been worn and washed for about six months (including a few rounds in the dryer, which neither manufacturer recommends). Enro masks can be machine-washed but should be hung to dry, and Happy Masks models should be hand-washed and air-dried. In the lab, both masks showed a reduced ability to block particles. The well-worn Happy Masks Pro showed about 30% filtration efficiency for 0.5-micron particles (granted, the manufacturer recommends that the Happy Masks model not go into a washing machine at all, which this mask had many times). The much-used Enro mask showed about 44% filtration efficiency for 0.5-micron particles, less than half of the value measured with a brand-new Enro. The well-used Enro and Happy Masks Pro masks, however, still blocked particles two to four times better than a cloth mask with no filter. Enro told us that if the mask started to look weathered (which ours did), it was time to replace it.

It’s also important to note that there are limitations to this type of lab testing. For one thing, the test doesn’t account for the fit-related gaps you’d see in the real world; these gaps can be minimal or significant, depending on the size and shape of a particular child’s face. Also, as researcher Saif explained, breathing in and out creates a different kind of airflow compared with that seen in the test settings—the lab test is like one long exhale, it also doesn’t take into account dramatic changes in air movement as would happen during coughs, sneezes, and shouts. The ability to filter air is just one factor to consider when choosing a mask; fit, comfort, and breathability are also important, especially for kids.

Finally, it was notable that some masks claiming to have built-in filters did not always demonstrate improved filtration in our tests, when compared with standard cloth masks.

Why we like it: The WellBefore Kids KN95 offers excellent filtration, and it’s more adjustable than most KN95s for kids. In our independent lab test, this mask filtered as well as a standard N95, blocking about 99.5% of 0.5-micron particles. (Our lab test didn’t account for fit, and air may come in and out around the edges of the mask when someone is wearing it.) The WellBefore Kids is one of the few KN95 masks we’ve tested that come in multiple children’s sizes—in this case, a regular size (intended for kids ages 9 to 12), a small size (intended for kids ages 5 to 8), and an extra-small (intended for kids ages 2 to 4). However, we found that the extra-small is best for 2-year-olds or for older toddlers with especially petite faces; our 4-year-old tester fit best in the size small. The WellBefore masks have a nose-bridge wire, and they are among the few kids-size KN95s we’ve found that have adjustable ear loops; both of these things helped this mask achieve a good fit on a range of faces. And though they don’t have the range of patterns and colors that cloth masks do, the WellBefore KN95s come in a few solid colors (green, burgundy, and deep blue) as well as three camouflage patterns, plus the standard, medical-style white.

Flaws but not dealbreakers: As with other KN95s we tried, some kid testers reported that the masks had a strange smell compared with cloth masks (it may help to open the package and let the masks air out overnight).

Shape: cone

Dimensions: regular (ages 9–12), 5½ by 5¾ inches; small (ages 5–8), 4½ by 5 inches; extra-small (ages 2–4), 4.1 by 4½ inches

Notable features: nose-bridge wire, built-in filtration, adjustable ear loops

Why we like it: The Children’s Sized Powecom KN95 is among the least expensive kids-size KN95 masks we’ve found. It offers a fit and shape similar to that of the WellBefore KN95, though it lacks adjustable ear loops (which the WellBefore masks have). The Powecom does have a nose-bridge wire, and it’s cheaper. We found that it fit testers ages 4 to 10 well. In our independent lab tests, we found that the Powecom mask was highly effective at blocking even the smallest particles, filtering about 99.5% of 0.5-micron particles (though the lab test didn’t account for fit). We purchased Powecom masks from the authorized importer and distributor, Bona Fide Masks. This mask style is available in several colors.

Flaws but not dealbreakers: Some kid testers found that the masks smelled different from the cloth masks they were used to. So it may help to open the package and let them air out, especially for kids who are sensitive to smells. This mask may be a bit too small for kids over age 10; kids age 10 and up may want to try Powecom’s adult sizes.

Shape: cone

Dimensions: one size (7 by 6¼ inches)

Notable features: nose-bridge wire, built-in filtration

For 2- and 3-year-old toddlers, wearing a mask can take some getting used to. Angela Tomlin, a clinical psychologist and professor of clinical pediatrics at Indiana University, said it’s important to keep in mind that at these ages, toddlers are still learning how to wear a mask, and they may need frequent reminders and breaks. To get younger children used to wearing a mask, Tomlin recommends sitting in front of a mirror and practicing putting it on and taking it off, as well as wearing it around the house before they need to wear it out. She also suggests incorporating choosing a mask into the routine of leaving the house. Modeling (by parents and caregivers) is also important for children. It’s important to choose a mask that fits your child, because a too-big mask might make it difficult for a toddler to see, Tomlin said. In our own testing, we’ve found that adjustable ear loops are helpful for achieving a good fit on a small face, and a nose-bridge wire is less important for a small nose.

For 2- and 3-year-olds, we recommend trying the filter-incorporated Happy Masks Pro, which comes in a range of whimsical prints and bright colors, or the Happy Masks Ultra, which comes in an extra-small size (though we found it to be a bit too small for a 3-year-old tester).  If you want a disposable, filtered option for your toddler, this WellBefore KN95 comes in an extra-small size, which is only 4.1 inches wide, and it has adjustable ear loops.

If your child won’t tolerate the Enro mask, the Happy Masks Pro, or disposable masks, you may find basic, filterless cloth masks are the most practical options, especially for toddlers. The cone-shaped Scout & Indiana Kids Face Mask is one of our favorites for small toddlers, who may appreciate the lightweight fabric and fun prints. Joah Love’s masks are exceptionally soft, and the kids size was a good fit for our 2-year-old and 4-year-old testers; the mask has a pocket for a filter and also comes with a band so that it can hang like a necklace when the child takes it off. The simple Old Navy Triple-Layer Pleated Face Mask for Kids is one of the least expensive cloth masks we’ve tested; it fits small faces well and has those rubber ear-loop stoppers we like.

Cloth masks

If you’re looking for a reusable mask with robust filtration for smaller faces: The Happy Masks Ultra comes in an extra small size that will fit the smallest of faces. It is similar to our top pick, the Happy Masks Pro, but has a bit more structure that helps hold it away from the face. Like the Pro, the Ultra needs to be hand-washed.

Disposable masks

If you’re looking for an exceptionally lightweight, disposable, N95-style mask: The 4CAir AireTrust Nano Mask for Kids is a former top pick that is still a great choice. This KN95 mask should fit kids ages 4 to 10, and it has adjustable ear loops and a nose-bridge wire. Our lab tests confirmed that it filters about 99% of aerosol-sized particles (assuming a perfect fit). The downside is that it is considerably more expensive than other kids KN95s, including the ones that are now our picks.

If you want a KF94 with more face coverage: The Blue KF94 (“KF” stands for “Korean filter,” the Korean equivalent of an N95) has a unique shape that provides excellent coverage for bigger kids, and it has a nose-bridge wire. But it lacks adjustable ear loops, so it wasn’t the best fit for our 4-year-old tester.

If you want a box of surgical-style masks:DemeTech size-small masks come in boxes of 50, and our independent lab test showed they filtered effectively. However, they’re expensive, and they lack adjustable ear loops.

If you want a few surgical-style masks:EvolveTogether kids masks are lightweight and sold in packs. However, they lack adjustable ear loops, and they’re expensive.

Masks with filtration

The Stark Mask has adjustable ear loops, but it lacks a nose-bridge wire. And it didn’t contour to our testers’ faces, leaving gaps along the top and bottom.

The FloMask has a silicone gasket that helps prevent air from coming in or out around the edges. The company’s lab tests show that the FloMask’s filters are effective at blocking aerosolized viruses; however, the filters did not fit on the apparatus of the independent lab that performed our testing, so we could not confirm their results. Some kid testers liked the around-the-head straps and said that the mask was comfortable, but other testers were not willing to wear this mask for long periods. It is also the most expensive mask we tried.

Cloth masks without filtration

The following masks do not have an integrated filter, but we’re including them as options for children who won’t tolerate the Enro mask, the Happy Masks Pro, or disposable masks.

The Halo Mask is a soft, bamboo-and-Lycra-blend mask, and the size small fits kids as young as 4. This mask has adjustable ear loops and a filter pocket that fits a full-coverage filter (sold separately by the same company). The main downside is that getting the filter in can be difficult, and you must remove it for washing.

We tested the Levi’s mask, which is well priced and comes in multiple sizes. But the fabric was much too dense to be breathable. And this mask ties around the head, which we note could pose a strangulation hazard.

The Old Navy Triple-Layer Pleated Face Mask for Kids is the best inexpensive cloth mask for kids we’ve tested. Many of our kid testers (and their parents) found the three-layer pleated cotton masks to be reliable, durable, and capable of fitting a wider range of ages better than other basic pleated masks we tested. But it doesn’t have a filter, and the Old Navy mask blocked fewer aerosol-sized particles than cloth masks with built-in filters and disposable respirator and surgical-style masks.

The cone-shaped, filterless Scout & Indiana Kids Face Mask stands out for its offbeat prints and patterns. The thin adjustable ear loops are comfortable for toddlers, and they help the masks achieve a precise fit. And though this mask seems thinner than the other cloth masks we tested, our lab tests showed that its fabric provided just as much filtration as all of the filterless cloth masks. The Little Kids (ages 3 to 6) size was great for a 2-year-old, a 3-year-old, and a 5-year-old, but it seemed a tad small on a 6-year-old.

We also tried the Cubcoats mask (currently unavailable), which was of low quality compared with even cheaper masks, like those from Old Navy. The nose-bridge wire wasn’t centered, the stitching wasn’t straight, and the synthetic fabric didn’t feel like it would hold up over time.

The Caraa kids mask offers desirable features such as adjustable ear loops, a nose-bridge wire, and a filter pocket. However, it’s the thinnest and smallest mask we tested (after washing); it measured just under 5 inches wide and 4¾ inches tall with the pleats unfolded, which is too small even for a 6-year-old. The toggles on the adjustable ear loops also came off easily.

The filterless City Threads Face Mask is one of the two softest masks of all we tested. However, it lacks adjustability, and some people had a hard time finding one that fit their child well.

The exceptionally soft, adjustable Joah Love mask has a children’s size, which was a good fit for our 2-year-old and 4-year-old testers. It has adjustable ear loops, and though they didn’t stay in place quite as well as ear loops with a rubber stopper, our toddler testers liked the soft fabric straps—and our 4-year-old tester was able to adjust the straps himself. However, this mask lacks a nose-bridge wire and an integrated filter.

The filterless Graf Lantz Petite Zenbu Face Mask is a smaller-size version of an adult mask. The petite version runs a bit large for small kids, though, at 7½ inches by 3 inches when folded, and some testers found it difficult to breathe through. It also doesn’t have an integrated filter.

Some kids might like Sommerfly’s “sensory-friendly fabric” mask. This is one of the only kids masks we found that has an around-the-head strap with a safety-release clip, to avoid any strangulation hazard. It may be a good choice for kids who can’t tolerate ear loops, but it may not fit as snugly as a mask that has two connection points.

Disposable mask

The WellBefore Kids boat-shaped KF94 is much thicker than other KN95/KF94 masks we tested, and our testers found it difficult to breathe through.

Most cloth masks can be machine-washed according to the manufacturer’s instructions. Happy Masks need to be hand-washed, and doing this is fairly simple: Swish the mask in a bowl of water with dish soap, and then rinse it in clean water and hang to dry. (Happy Masks also has a how-to video). Hot washing is not necessary, and it can shrink fabrics and “hasten wear and tear over time,” Cornell fabric scientist Juan Hinestroza told us.

As for a detergent, Cincinnati Children’s Hospital Medical Center’s Felicia Scaggs Huang told us in an interview that she recommends washing masks in fragrance-free detergent, since perfumes can irritate kids’ airways. Most cloth masks can go in the dryer. But if you’re willing to forgo that convenience, you can prolong a mask’s life by hanging it to dry.

When kids are wearing masks to school, they should put on a clean one “at least daily,” Dr. Shu said. “If they have the luxury of bringing two to three a day, that would be nice,” she added. “A damp mask is better than no mask,” she said, but “once it gets wet, it might be a good idea to change it.”

We came across several masks that the sellers described as being “antimicrobial,” which refers to being antibacterial, not antiviral. “They may be effective in preventing bacterial growth on the mask, but they won’t kill coronavirus,” Dr. Shu said. Washing masks with regular laundry detergent should be sufficiently effective at preventing bacteria from growing, as well as killing viruses on the mask.

For disposable masks, the CDC indicates they can be reused by allowing them to dry between uses, but it notes they should be “discarded if soiled, damaged, or hard to breathe through.” We offer more guidance on reusing N95, KN95, and other disposable masks here.