TOPTIE Men's Compression Muscle Short Sleeve T-Shirt 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. Fitted short sleeve. 90% polyester / 10% spandex. Fast-drying, breathable functional fabric. Please note the fabric of color grey is upgraded which is different from others. Ideal for a variety of training conditions. Flat seams reduce chafing as you move.