Tesla SSTM-T11-CTG_Medium j-L Men's Cool Compression Long Sleeve Quick Dry Running Sports Baselayer Underwear Underlayer Atheletic Gym Swimming Skin Clothe Coolgear shirts&pants are designed for all seasons (not for Warmth) Find your size on the chart below. If you prefer a looser fit, go up a size. 87% polyester-13% 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.