I use these 100% poly "wicking" t-shirts for exercise -- they really work. I like these the best because they have the fewest seams: less possibility of chafing. Also the fabric is dense and opaque, even in light colors, and without obvious logos, so I've even worn these under a suit jacket, or as a casual "T". Fabric is very silky but not clingy. Runs true to size. V-neck is modest but enough to make noticeably cooler then crew-neck. Have several and they hold up well in washing.