Now, I'm not saying you need to trek in a Hazmat suit. However, similar principles apply. Tuck tops into pants, and pants into socks. That sort of thing. The leeches will get in if you don't. They are resourceful little buggers. Be prepared to flick them off your clothes, hair, forehead, and from inside your bra.They're pretty much harmless though, just super annoying and a little bit itchy afterward. Note: if they have already fed and fall off on their own, it's supposed to itch less. My skin is not very sensitive so I've not really noticed a difference.