Picaridin is the answer.

Yes, and it’s not even close. Ditch the DEET and use Picaridin.

DEET works fine, but it’s greasy, smells like a chemistry lab, and melts your gear. In humid environments, that greasiness turns into a sticky mess that attracts dirt and sweat. Picaridin solves all of that. It’s as effective as high-concentration DEET against mosquitoes (including the ones that carry dengue and malaria), but it’s odorless, non-greasy, and won’t destroy your tent fly or rain jacket.

For humidity specifically, Picaridin holds up better. Sweat doesn’t wash it off as easily as natural oils, and it doesn’t feel like you coated yourself in motor oil. I’ve used the 20% concentrate in Southeast Asian jungles and it lasted a solid 8-10 hours. The 10% sprays need more frequent reapplication, but they’re fine for shorter trips.

The one natural option that actually works: Oil of Lemon Eucalyptus (OLE). Not the synthetic “lemon eucalyptus” fragrance oils—look for PMD as the active ingredient. It’s effective but requires reapplication every 2-3 hours, especially when you’re sweating. Fine for a short hike, annoying for a full day of camping.

Don’t forget clothing. Permethrin-treated clothes are a game-changer. Spray your