My husband used to wear performance fabric shirts to keep him cool when he was a bartender at a club with a patio. Recently we joined a gym and he started looking for some new shirts but complained how expensive they were. So I checked Amazon and voila! This double dry training t shirt is just what he wanted--at a great price! I ordered the air force blue in large. It's a little big, but fine for exercising. (My husband is 5'7" and normal weight.) He says he is so much more comfortable and cooler when he works out in this shirt than in a regular cotton shirt. I ordered him a second one in white.