X31 Sports Men's Performance Base Layer Workout T-Shirt for Running, Gym, Fitness 90% Polyester / 10% Elastane SEMI-FITTED ATHLETIC CUT: Light compression workout shirt fits close to the body without restriction for better mobility and increased range of motion during workouts. LIGHTWEIGHT: Soft 4-way stretch fabric in this mens running shirt provides improved comfort and breathability to keep you cool during long workouts. MOISTURE WICKING: Technology sports shirt helps to keep you dry even in the most intense training sessions. LONGER LENGTH HSP: Men's Gym Shirt designed for better coverage during overhead movements like pull-ups and overhead press. FLATLOCK SEAMS: Strategically placed flatlock seams to reduce chaffing make this a perfect choice as a mens baselayer performance top.