Permethrin vs. DEET: What to Use on Skin vs. Clothing

Walk into any outdoor retailer before a camping trip, and you'll probably find both DEET and permethrin on the shelves. They’re both trusted tools for insect protection, but they are not interchangeable.

DEET is a skin-applied insect repellent. It is used on exposed skin to help keep mosquitoes, ticks, biting flies, and other insects from finding or biting you.

Permethrin is different. It is applied to clothing and gear, never directly to skin. On treated fabric, it can help repel, knock down, or kill ticks, mosquitoes, and other insects that make contact with the treated material.

For many outdoor situations, especially in tick country, the strongest approach is to use both correctly: permethrin-treated clothing for covered areas and DEET on exposed skin.

What to Use Where

DEET and permethrin solve different problems. DEET helps protect exposed skin. Permethrin-treated clothing and gear help protect the areas covered by treated fabric.

Key Takeaways

• DEET goes on exposed skin. It is a topical repellent that helps protect uncovered skin from mosquitoes, ticks, biting flies, and other insects.
• Permethrin goes on clothing and gear, never directly on skin. On treated fabric, it can help repel, knock down, or kill insects that make contact with it.
• For ticks, clothing matters. Ticks often contact shoes, socks, and lower pants first, which makes permethrin-treated clothing especially useful.
• The strongest approach uses both. Wear permethrin-treated clothing and apply DEET to exposed skin, following each product’s label directions.
• Always choose EPA-registered products. Use each product only as directed on the label.

Permethrin vs. DEET for Ticks: Which Is Better?

For tick prevention specifically, this is not really an either/or question. DEET and permethrin help in different ways.

DEET can help protect exposed skin. Permethrin-treated clothing helps protect covered areas, especially the places ticks are most likely to contact first: shoes, socks, pants, and lower-body clothing.

Expert tip

For ticks, treated clothing matters.

Dr. Thomas Mather from the University of Rhode Island's Tick Encounter Resource Center says that topical repellents can be helpful, especially against mosquitoes, but permethrin-treated socks and pants are especially useful for ticks because ticks often start low and crawl upward.

Read more tick prevention tips

Because ticks often contact shoes, socks, and lower pants first, permethrin-treated socks are one of the simplest ways to add protection where ticks are most likely to contact first.

Layer DEET on exposed areas, such as ankles above the sock line, wrists, neck, and other skin not covered by clothing. Together, the two approaches help close gaps that either product may leave on its own.

How DEET Works

DEET is a skin-applied insect repellent. It works by interfering with the signals insects use to find people, making it harder for mosquitoes, ticks, and other insects to locate exposed skin.

DEET is especially useful when skin exposure is unavoidable, such as short sleeves in summer, open footwear, humid weather, or travel where mosquitoes are a major concern.

DEET can be effective against mosquitoes, ticks, biting flies, and other insects, depending on the specific product and label. Application matters, so always follow the directions on the product you are using.

Common mistakes when using DEET include:

• Applying it to broken or irritated skin
• Using it under clothing
• Applying it directly to a child’s hands and face
• Spraying it near eyes or mouth

The correct approach is simple: apply DEET to exposed skin only, avoid eyes and mouth, keep it off young children’s hands, and wash treated skin after you come back inside.

How Permethrin Works

Permethrin is a synthetic pyrethroid insecticide. It is modeled after pyrethrins, compounds naturally derived from chrysanthemum flowers. Unlike DEET, it does not work by making you harder to find. Instead, it acts on insects that come into contact with treated fabric.

When ticks or mosquitoes contact permethrin-treated clothing or gear, the treated fabric can help repel, knock down, or kill them. That contact-based effect is why permethrin-treated socks, pants, shoes, and gear are so useful in areas where ticks are common.

If you are using a home spray treatment, permethrin should be applied only to clothing and gear according to the product label. It should never be applied directly to skin.

Can you put permethrin on your skin?

No. Clothing-treatment formulations of permethrin are not made for direct skin application. Use them only on clothing and gear as directed by the label.

With Insect Shield clothing, the permethrin treatment is applied during manufacturing and bonded to the fabric fibers. There is no spraying, drying time, or handling of liquid permethrin at home. You simply wear it like regular clothing and follow the garment care instructions.

Permethrin vs. DEET for Mosquitoes

For mosquitoes, DEET on exposed skin is often a core part of the strategy. Mosquitoes are skin-seeking insects, so a repellent applied directly to uncovered skin can help reduce bites where clothing does not cover you.

Permethrin-treated clothing adds another layer for covered areas. It can help reduce mosquito contact with treated fabric and around edges like cuffs, collars, and sock lines.

For travel to areas where mosquito-borne illness is a concern, combining both approaches can be especially useful: permethrin-treated clothing during the day, DEET on exposed skin when needed, and treated gear or mosquito nets when appropriate.

For everyday summer use, such as backyard evenings, weekend hikes, gardening, or outdoor dining, the same layered approach can still be helpful. DEET protects exposed skin. Insect Shield clothing helps protect covered areas without having to treat clothing before every wear.

Duration and Reapplication: What to Expect

DEET’s protection window depends on the product, concentration, conditions, and label directions. Heat, humidity, heavy sweating, and water exposure can all affect how long protection lasts, so always follow the product label for reapplication timing.

Permethrin-treated clothing is different. Its duration is usually measured by washes, not hours. Factory-applied treatments like Insect Shield are designed to remain effective through 70 launderings under normal care conditions.

Home spray-on treatments work differently and typically require re-treatment after several washes, depending on the product. As with DEET, the specific product label is the best source for reapplication guidance.

Already have outdoor clothing you like?

Insect Shield Your Clothes lets you send in eligible clothing for professional permethrin treatment, so you can add longer-lasting protection without spraying items yourself at home.

TREAT YOUR CLOTHES

Safety Considerations

DEET has a long track record of use when applied as directed. For adults, the main guidance is straightforward: follow the label, avoid eyes and mouth, do not apply to broken or irritated skin, and do not apply under clothing.

For children, an adult should apply DEET. Spray it into your own hands first, then apply it carefully to the child’s exposed skin, avoiding hands, eyes, and mouth. Follow the product label for age guidance and use directions.

Permethrin safety depends heavily on the form you are using. If you are treating clothing or gear at home with a permethrin spray, follow the product label closely. Apply it outdoors or in a well-ventilated area, let items dry completely before wearing or handling, and keep cats away during application and until treated items are fully dry.

Factory-treated clothing offers a simpler option because there is no spraying, drying time, or handling of liquid permethrin at home. With Insect Shield clothing, the treatment is applied during manufacturing and bonded to the fabric fibers, so you wear it like regular clothing and follow the garment care instructions.

How to Use DEET and Permethrin Together

1. Start with treated clothing. Wear permethrin-treated socks, pants, shirts, hats, or other clothing based on your activity. If you are using a home spray treatment, apply it ahead of time according to the label and allow items to dry completely before wearing.
2. Apply DEET to exposed skin. Use it on areas not covered by clothing, such as arms, neck, backs of hands, and ankles above the sock line. For the face, spray it into your hands first and apply carefully, avoiding eyes and mouth.
3. Protect the highest-risk areas for ticks. Ticks often start low, so socks, shoes, and pants matter. Consider permethrin-treated socks and pants or spray-treated footwear when spending time in tick habitat.
4. Check for ticks afterward. After time outside, do a full-body tick check. Pay close attention to the hairline, behind the knees, underarms, waistband, and other warm, hidden areas.
5. Use heat for clothing after tick exposure. If ticks may have hitched a ride on your clothing, putting clothes in a dryer on high heat for 10 minutes can help kill ticks.

Find the right protection for your next time outside

Choose the option that best fits how you spend time outdoors.

For everyday tick protection

SHOP SOCKS & CLOTHING

For shoes, gear, and camping items

SHOP PERMETHRIN SPRAY

For clothing you already own

TREAT YOUR CLOTHES

FAQ: Common Questions About DEET and Permethrin

Can I put permethrin directly on my skin?

No. Clothing-treatment formulations of permethrin should not be applied directly to skin. They are made for clothing and gear. For exposed skin, use an EPA-registered repellent labeled for skin application, such as DEET or picaridin.

Can I use DEET on my clothes?

DEET is intended for skin application and can damage certain plastics, rubber, vinyl, elastic materials, and some synthetic or treated fabrics. For clothing and gear, use a permethrin product labeled for fabric treatment or choose factory-treated clothing.

Is it safe to use DEET and permethrin together?

Yes, when each product is used as directed. Permethrin goes on clothing and gear. DEET goes on exposed skin. They are used on different surfaces and can work together as part of a layered protection strategy.

Which is better for ticks, DEET or permethrin?

For ticks, permethrin-treated clothing is especially useful because ticks often contact shoes, socks, and lower pants first. DEET can still help protect exposed skin, so the best approach is usually to use both correctly.

What else reduces tick risk beyond repellents?

Treated clothing and skin repellents work best with good tick-prevention habits. Stay near the center of trails, avoid brushing against tall grass and leaf litter when possible, tuck pants into socks in heavy vegetation, do a full-body tick check after time outside, and shower soon after coming in.

Explore Permethrin Spray & Permethrin-Treated Clothing