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I just got back from a week-long vacation in Florida, where I was birding the Everglades and other wetlands. This shirt actually seemed to make a difference, although it's hard to say for sure. I do know that I got bit around the ankles and calves, but had not a single bite on anything covered by this shirt. I also didn't have a big problem with the skeeters around my ears and face. Occasionally one would come buzzing around, but nothing really stayed. The shirt is not super flattering, but it is soft and very comfortable, and it doesn't have a weird smell. I used very little bug spray (and none on the shirt), and I think this helped me reduce my use of DEET. I wouldn't wear this just for everyday, but I'm glad to have it for use against mosquitoes (and ticks, which are a bigger problem for me at home in the Northeast). The warmth is medium. It'll be too hot for a warm day, but anything up to about 65 degrees and light activity will be ok.