On those body parts that aren’t covered with SPF-clothing, you want to be darn sure you wear a proven-effective sunscreen. Forget the enticing coconut-butter fragrances and oils. You want sun block in the jungle. I wore Beyond Coastal 15SPF and 30SPF the entire time I was in Bolivia, and didn’t burn. What’s best about this stuff is that it lasted through all the hiking, sweating, and wet-wading. When I climbed out of the tent in the morning, the sunscreen went on first (the sunscreen has to soak into the skin to work effectively). I waited another 10 minutes, then layered the Ultrathon on top. No negative interactions at all.