TSLA Men's Mesh-Side-Back Panel Long-Sleeved T-Shirt Compression Baselayer MUD71 / R19 We recommend ordering ONE size up (Regular Fit) Order usual size ( Extreme Compression Fit) MUD71 designed for all seasons (Releases heat and wicks moisture with a cooling effect) 87% polyester-13% Spandex. Excellent elasticity with enhanced range of motion. Stretch-mesh back to side panels provide strategic ventilation Moisture Sensing/Quick time Dry/TWO-WAY Air Circulation. Safeguards your skin from harmful UV rays by more than 99% (UPF 50+)