Permethrin Clothing: What It Is and How to Use It Safely

If you spend real time in tick country, treating your clothing with permethrin is one of the most effective steps you can take — and one of the most misunderstood. Here's how it works.

What permethrin is

Permethrin is an insecticide that bonds to fabric rather than absorbing into skin. Treated clothing repels and kills ticks on contact. In research, people wearing permethrin-treated footwear and clothing were dramatically less likely to be bitten.

Why it's so effective

Most repellents you apply to skin; permethrin turns your clothing itself into a barrier. Ticks typically climb from your shoes upward, so treated socks, shoes, and pant legs stop them early — before they reach skin.

How to use it safely

• Apply to clothing only — never to skin. Treat garments outdoors and let them dry fully before wearing.
• Follow the product label for coverage and drying time.
• Once dry, it's bound to the fabric and safe to wear; a treatment lasts through several washes (or buy pre-treated garments that last longer).
• Caution with cats: wet permethrin is toxic to cats — dry clothing is fine, but treat and dry away from them.

Make it part of a system

Permethrin clothing pairs perfectly with a skin repellent and a drug-free layer. Treat your gear, add a spray or a clip like Roam Repel for exposed areas, and finish with a tick check. See the full routine in our prevention guide.

This article is for general information and isn't medical advice. Always follow the product label.

Source: CDC — Preventing Tick Bites