Protect yourself and others in your group from biting insects, ticks, and insect-transmitted diseases with the Adventure Medical 3. 4oz Natrapel Pump Spray. This DEET-free repellent fends off insects with a 20% concentration of Picaridin, which is the amount recommended by the CDC to guard against insect-transmitted diseases. It provides eight hours of protection, and is clinically proven to perform as well as, or better than, DEET-based products. Compared to DEET-based products, Natrapel is safer on gear, smells better, and won't cause adverse reactions. The 3. 4-ounce bottle size is large enough for bigger groups or extended trips, and small enough to be allowed in your carry-on if you're traveling by plane.