Nobody wants to workout in a heavy, sweat-soaked shirt. The DeltaPeak material used to make this training shirt from Reigning Champ ensures that won't be an issue. While it's dense enough to maintain its shape and prevent snagging, it's also fast-drying, anti-microbial (and thus anti-stink), and protective against UV rays for outdoor activities. The build itself is also movement-friendly, with flat locked seams, raglan sleeves, and gusseted underarms.