This was one of the major topics of discussion for our trip. So much so that I was prepared for swarms. In case anyone is wondering, I just got off the Deso and am happy to report I didn't get a single mosquito bite. I can't even recall hearing one. Slept tent free several nights. I think I got one deer fly bite. On the other hand, once I got home and was sorting gear in my garage I got about 15 ankle biter bites and had to spray down. Enjoy.