TOPTIE Men's Fitness Racer Back Tank Top Please check our SIZE INFO in description or picture rather than Amazon's "Size Chart" to pick a suitable size. Tight fit, we recommend ordering ONE size up what you normally wear. 90% polyester / 10% spandex. Polyester fabric for a soft, comfortable feel that pulls away sweat. Please note the fabric of color grey is upgraded which is different from others. Sleeveless, ideal for a variety of training conditions. Fitted design. Flat seams reduce chafing as you move.