Use an EPA-registered DEET product on exposed skin and 0.5% permethrin on clothing, boots, and gear — never on skin.
The mosquito lands, you swat, and it’s gone. A tick crawls onto your ankle and stays for hours, and that difference is why one spray strategy isn’t enough. DEET and permethrin do two separate jobs, and the CDC’s tick prevention guidance treats them as a pair: repellent for skin, insecticide for fabric. Get the split right and both products work harder.
What Does DEET Actually Do on Skin?
DEET is a topical repellent: it makes exposed skin less appealing to ticks and mosquitoes, lowering the odds of a bite.
Pick an EPA-registered product whose label explicitly claims tick protection — the EPA Registration Number on the label is your proof it’s been reviewed. Guidance recommends DEET concentrations of 20% or more for protection, and jumping above 50% buys you nothing extra. Apply just enough to cover exposed skin, follow the label’s reapplication interval, and keep it off cuts, irritated or sunburned skin, and anything under your clothes.
The face is the part people get wrong. Spray into your hands first, then rub it on — never directly at your face, eyes, mouth, or ears. Wash treated skin once you’re back indoors. If sunscreen is in the mix, sunscreen goes on first and repellent second. Parents should apply it for kids, skipping the child’s hands, eyes, and mouth, and check the label’s age limits before you buy.
How Do You Apply Permethrin to Clothing and Gear?
Permethrin is an insecticide and acaricide used on fabric, not skin — at 0.5% concentration it repels and kills ticks on contact.
Buy a product labeled for treating clothing or fabric specifically; plenty of permethrin pesticides aren’t approved for that use. Then treat the items ticks actually grab: boots, socks, pants, hats, outerwear, plus camping gear and mosquito nets. Commercially pretreated clothing is a solid shortcut if you’d rather skip the spraying.
Apply outdoors in a well-ventilated spot out of the wind, follow the label, and don’t over-treat. Hang everything outside to dry completely before wearing it, and never treat clothing while you’re wearing it. Wash treated items separately unless the label says otherwise. For a trip, the CDC advises treating gear 24–48 hours before packing so it’s fully dry.
| Feature | DEET | Permethrin |
|---|---|---|
| Goes on | Exposed skin only | Clothing, boots, gear |
| Effective concentration | 20%+; over 50% adds nothing | 0.5% for fabric treatment |
| How it works | Repels ticks and mosquitoes | Repels and kills ticks on contact |
| Reapply | Per label interval | Lasts several washings |
| Skin contact | Intended | Never apply to skin |
| Binds to fabric | Not applicable | Binds tightly, little skin transfer |
| Best for | Arms, legs, neck, face (via hands) | Pants, socks, boots, packs, nets |
Both products have to be current on the label you’re holding. The National Pesticide Information Center’s insect repellent fact sheet is a handy plain-language check on active ingredients and application rules.
Which Mistakes Undo the Protection?
Using one product in place of the other is the most common error, and the CDC’s tick prevention page is blunt that treated clothing doesn’t replace skin repellent, tick checks, or prompt removal.
Watch for these:
- Spraying permethrin fabric treatment on your arms or neck.
- Buying a product that isn’t EPA-registered or whose label makes no tick claim.
- Spraying repellent through a shirt onto covered skin, or onto broken, irritated skin.
- Skipping the tick check after a hike, or waiting too long to shower.
When you’re back inside, inspect your body, clothing, and gear — hair, ears, underarms, waist, groin, backs of knees, and the belly button are the spots people miss. Shower promptly, ideally within two hours. Dry clothes on high heat for 10 minutes; damp items may need longer. Cold and medium-temperature washes don’t reliably kill ticks. If you’re stocking up for tick season and want the products people actually reach for, our tested bug spray picks for ticks cover what’s worth buying.
Common Questions
Can I spray permethrin on my skin?
No. Permethrin products labeled for fabric treatment must never go directly on skin. If you want skin protection, use an EPA-registered DEET product separately. Treated clothing works alongside your skin repellent rather than replacing it.
Does higher DEET concentration mean longer protection?
Up to a point. Guidance recommends 20% DEET or more for protection, but products above 50% provide no added benefit. Going higher than 50% doesn’t buy you more time — it just means more chemical on your skin for the same result.
How long does permethrin-treated clothing stay effective?
Properly applied permethrin binds tightly to fabric, transfers little to your skin, and holds up through several washings. Exact durability depends on the product label and how you launder the item, so check the instructions that came with your bottle or pretreated garment.
Sources
- CDC. “Preventing Tick Bites” Core tick prevention guidance including DEET and permethrin use.
- CDC. “Preventing Lyme Disease” 0.5% permethrin clothing treatment and travel timing.
- National Pesticide Information Center. “Insect Repellents” Plain-language factsheet on active ingredients and application.