Tesla TM-LTT-BB_Medium Men's Cool Dry Compression Baselayer Mock Long Sleeve T Shirt LTT Find your size on the chart below. If you prefer a looser fit, go up a size. 84% polyester-16% spandex. Excellent elasticity with enhanced range of motion. Perfect option during various indoor activities and outdoor excursion. Moisture Sensing/Quick time Dry/TWO-WAY Air Circulation. Lightweight (4.23oz / Long sleeve_Size Medium) provides comfortable feeling against skin.)