Tesla CLSL TM-WR13-GRNZ_Medium Women's Round Neck Top Short Sleeve Lightweight Sports T-Shirt WR13 We strongly recommend ordering ONE size up what you normally wear. TeslaGear WR13 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.