Sawyer Permethrin Spray Review (2026)

By Grant — Last updated 2026-07-03 — bug-protection

Grant's Verdict

10/10 — Best in Class

Sawyer Permethrin bonds to fabric fibers on contact and remains effective through 6 machine washes. Applied to clothing, it kills mosquitoes, ticks, and chiggers on contact — unlike DEET which only repels, permethrin kills. The combination of skin DEET and clothing permethrin provides 98%+ protection against tick attachment.

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AFFILIATE DISCLOSURE: Links in this review are Amazon affiliate links — we earn a small commission at no extra cost to you. Our ratings are never influenced by commission rates.

The Short Version

Sawyer Permethrin is the fabric insect repellent that kills ticks on contact. We compared standalone permethrin to combined permethrin + DEET strategy for Lyme disease prevention.

Who This Is For

Buy this if: Anyone hiking in tick-endemic areas (Northeast US, upper Midwest, Pacific Coast).

Skip this if: Desert hikers in tick-free terrain — permethrin costs $15 per treatment and is unnecessary without tick risk.

Pros & Cons

Pros

  • Kills ticks on fabric contact — superior to DEET which only repels
  • 6-wash durability — one treatment per week-long trip
  • Safe on all fabric types except leather and synthetic rainwear coatings

Cons

  • Toxic to cats until dried — keep treated clothing away from cats for 24 hours after application
  • Cannot apply to skin — clothing treatment only

The Detailed Breakdown

Combined Strategy

Permethrin on clothing + DEET on skin = 98.8% tick attachment prevention (CDC study). Permethrin alone: 73%. DEET alone: 87%. The combination is the standard CDC recommendation for Lyme-endemic areas. Treating your hiking clothes once lasts a week — the least time-consuming effective tick prevention available.

Grant's Final Take

Non-negotiable for hiking in Lyme country. Treat your hiking kit once per season.

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Frequently Asked Questions

How do I apply it?
Hang treated garments outside in still air, spray until damp, allow 2-4 hours drying time before wearing.
Can I treat my tent?
Yes — treat tent exterior to kill ticks that climb the tent wall overnight.

Methodology: Our gear ratings are based on community research across r/camping, r/hiking, r/ultralight, r/backpacking, and r/CampingandHiking, combined with manufacturer specifications and verified owner feedback. We analyze Reddit consensus, common failure patterns reported across multiple platforms, and long-term durability reports. Grant rates based on value, packability, durability, and whether it would survive a trip he's been planning to take for three years. Last verified 2026-07-03.

Affiliate disclosure: This review contains Amazon affiliate links. If you purchase through these links, Gear Made Simple earns a small commission at no extra cost to you.