Using insect and tick repellents safely

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With tick season ramping up again this spring, it’s time lớn marshall your tools for keeping biting, disease-causing bugs at bay. Using bug spray is one important strategy, as is keeping your yard unfriendly khổng lồ mosquitoes và ticks.

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But the Centers for Disease Control & Prevention also recommends another strategy on vị trí cao nhất of those two: treating your clothing with a pesticide called permethrin. (A repellent keeps bugs away; a pesticide kills or disables them on contact.)


Permethrin-treated clothing, first developed by the military a few decades ago, has been available lớn consumers since 2003. And there are a few ways to use it. You can buy pretreated clothing from various manufacturers (especially those that specialize in outdoor gear). At least one company, Insect Shield, will treat your clothes with permethrin for you, if you mail them in. & you can vì it yourself: Permethrin spray is available for consumers lớn buy và apply lớn their own clothing and gear.

“If it’s used correctly, it works really well,” says Thomas Mather, PhD, director of the University of Rhode Island’s Center for Vector-Borne Disease, of treating clothing with permethrin yourself. But the key, he says, is khổng lồ use it correctly, which not everyone does.

Here, we’ll explain why permethrin-treated clothing might be an option you want to lớn consider for protection against ticks & mosquitoes, how lớn make sure you get the best protection, & how lớn treat clothing with permethrin the right way.


A number of studies have found permethrin-treated clothing can help protect against mosquito bites, though results may differ depending on a variety of factors, such as the species of mosquito, the way the clothing is treated và laundered, và the level of pesticide-resistance among the mosquitoes.

Consumer Reports has also tested several brands of clothing pretreated with permethrin khổng lồ find out how well they worked at stopping mosquitoes from biting. Two types we tested in năm 2016 kept mosquitoes from biting, but two didn’t. A shirt we sprayed with a deet-based repellent, meanwhile, kept mosquitoes from biting & kept them from even landing, something none of the permethrin-treated clothing items did.

Permethrin is “very irritating lớn ,” says Joe Conlon, a former Navy entomologist and former technical adviser khổng lồ the American Mosquito Control Association. “It’s lượt thích they landed on an electric grid.”

The permethrin-treated clothing also resulted in “knockdowns,” meaning mosquitoes were incapacitated or killed after contact with the clothing. The shirts we sprayed with deet didn’t cause any knockdowns, however, because no bugs ever landed on them.

And what about ticks? Consumer Reports’ testing hasn’t evaluated how well permethrin-treated clothing works against ticks. But other research shows permethrin can be effective against ticks. In one 2020 study of outdoor workers in Rhode Island and Massachusetts, there were a total of 60 tick bites over two years among the 40 workers who used permethrin-treated clothing, compared with 166 tick bites among the 42 workers who didn’t use treated clothing.

Manufacturers of permethrin spray for clothing lưu ý that because the spray is meant only for fabric & not for skin, for full protection people also need to lớn use an insect repellent on their exposed skin. Consumer Reports’ experts agree.


The most important thing khổng lồ remember when spraying your clothing with permethrin is that you must follow the instructions on the product label. If you don’t, you could be violating federal law, Conlon says. (Because permethrin is a pesticide, the Environmental Protection Agency regulates its use.)

It’s also important khổng lồ follow the instructions on the label khổng lồ ensure you’re using the pesticide as safely as possible, says Michael Hansen, PhD, a senior scientist at Consumer Reports. “It’s an endocrine-disrupting compound," he says. That means “if it gets into your system, there can be effects on the hormonal system."

The CDC notes that permethrin và related chemical compounds can cause serious health problems in people exposed to lớn high doses. “You don’t want to lớn be inhaling it or getting it directly on your skin," Hansen says.

If you follow the directions on the label, however, the dose of permethrin you receive by wearing treated clothing is considered safe, even for pregnant women. (Higher concentrations of permethrin are used in medications for treating both head lice and scabies.)


Spray only your clothing. We said it before, but it’s worth repeating: Permethrin spray is only for your clothes và gear. Don’t apply it to your skin. And when treating clothes, stick khổng lồ outerwear: The Environmental Protection Agency says you shouldn’t treat underwear with permethrin.

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Spray while the clothes are off your body. Hang them on hangers outside, & spray them down while they hang. Don’t apply permethrin to your clothes while you’re wearing them, & don’t apply permethrin indoors, where you could risk inhaling it.

Never spray around cats. Keep your feline friends away from the area while you’re treating your clothes because permethrin is highly toxic to cats. According khổng lồ Sawyer, which makes permethrin products, treated clothing is not dangerous to lớn cats once it has dried.

Spray enough, but not too much. Mather says he often sees people making the mistake of giving their clothes a quick spritz of permethrin. But it takes a slightly heavier hand for full protection. Mather says you should spray enough for your clothes lớn become damp (they should look a little darker in color). You don’t need khổng lồ drench them—to where they’ll drip if you wring them out—but they vị need a thorough coat.

The sản phẩm labels can help give you a good idea of how much lớn use. For example, the label on Sawyer’s permethrin aerosol spray says that a 9-ounce bottle will treat a shirt, a pair of pants, và a pair of socks.

Let the clothes dry completely. Before you wear them, they should be totally dry. That should take a few hours, depending on the humidity of the day.

Re-treat when necessary. Manufacturers of pretreated clothing say their products are still effective after many washes (L.L.Bean claims 70, for example). But the clothes you treat yourself need khổng lồ be re-treated much more often. Sawyer says you need lớn re-treat after six washings, for example. Even clothes or gear you don’t wash need re-treating; Mather says he sprays his và his family’s shoes monthly.

Actually wear them. Mather says some people say they’re saving their permethrin-treated clothing for heavy-duty camping or hiking. But ticks don’t live just in the deep woods. If you live in an area where ticks are common, he recommends wearing your treated garments even during casual activities, like taking your dog for a walk.

Consider treating other gear. Conlon says that camping gear lượt thích tents, backpacks, và hiking boots are also good candidates for treating with permethrin. 

Wash treated clothing separately. Sawyer recommends hand washing or using the gentle cycle on your machine to lớn best preserve the protection.

Only use permethrin approved for clothing. That will be indicated on the label. You may be tempted khổng lồ purchase permethrin pesticide (or related chemicals) meant for agricultural uses and dilute it down khổng lồ a concentration of 0.52 percent, the industry standard for clothing. Not only is that illegal but it’s also risky because you could make a mistake and end up with the wrong concentration. & there’s no guarantee it will work as well, Mather says, because the permethrin products meant for clothes are formulated with ingredients that help it stick khổng lồ fabric. The agricultural products may not have those ingredients.

Don’t rely on permethrin alone. Using permethrin-treated clothing is one useful step lớn take for preventing bites. But it’s not the only one. Because permethrin goes only on clothes, if you rely on it alone, you may still be leaving plenty of skin exposed and vulnerable khổng lồ a bug’s bite (if, say, you’re wearing shorts và short sleeves instead of long pants & long sleeves). To lớn protect your exposed skin, use an effective insect repellent, such as one that contains 15 to lớn 30 percent deet, trăng tròn percent picaridin, or 30 percent oil of lemon eucalyptus. Make sure you apply it right, and remember you can use repellent on your clothing as well if you’d rather skip the permethrin.


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Catherine Roberts

As a science journalist, my goal is to lớn empower consumers lớn make informed decisions about health products, practices, and treatments. I aim to investigate what works, what doesn"t, và what may be causing actual harm when it comes lớn people"s health. As a civilian, my passions include science fiction, running, Queens, và my cat. Follow me on Twitter:
catharob.


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