TSLA Men's Mock Long-Sleeved T-Shirt Cool Dry Compression Baselayer MUT12/T11/T01 We recommend ordering ONE size up (Regular Fit) Order usual size ( Extreme Compression Fit) MUT12 designed for all seasons (Releases heat and wicks moisture with a cooling effect) 87% polyester-13% Spandex. Excellent elasticity with enhanced range of motion. Non abrasion fabric material with excellent elasticity and durability Moisture Sensing/Quick time Dry/TWO-WAY Air Circulation. Safeguards your skin from harmful UV rays by more than 99% (UPF 50+)