TOPTIE Compression Base Layer, Short Sleeve, Men's 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. Neck tape added for durability and comfort. 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.