I tried one one season on a hot southwest US trip, but didn't like the feel of it at all. It was heavy and clammy and as Ghezzi commented, a lot of the moisture ends up in your lap. I also found it very inconvenient since it works best when really saturated, which takes a bit of soaking time, and then I had to carry it in a big zip-lock bag until I was ready to use it in the heat of the afternoon. All in all, I just found it to be a pain in the ass. Soaking my t-shirt works just as well really.