Insect Shield works, but it's not a replacement for DEET

Insect Shield clothing is effective at reducing mosquito bites, but it’s a convenience tool, not a standalone solution for heavy mosquito areas.

The active ingredient is permethrin — the same stuff you can buy in a spray bottle to treat your own clothes. The difference is Insect Shield binds it to the fabric so it lasts through about 70 washes. Studies show it reduces bites by 90%+ on covered areas, but only where the fabric touches skin. Exposed skin is still fair game.

Compared to DEET sprays: DEET covers your skin directly and works on any exposed surface. But it feels greasy, smells like a chemical plant, and needs reapplication every few hours. Permethrin-treated clothing is set-and-forget. You put it on, it’s active all day, no smell, no sticky residue. The catch is coverage — sleeves and pants don’t protect your hands, face, ankles, or neck.

If you’re going to a place with light mosquito pressure (think suburban backyard, mountain hiking), Insect Shield clothing alone is probably fine. For the tropics, dense jungles, or anywhere with malaria/dengue risk, you still want DEET (or picaridin) on exposed skin. The clothing is a great second layer, not the primary