TOPTIE Mens Tight Breathable Sport Vest Compression Fitness Athletic Tank Top 90% Polyester/10% Spandex 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. Material: 90% Polyester/10% Spandex. Stretchy and breathable compression t-shirt that pulls away sweat. Perfect slimming and lifting undergarment makes you look inches smaller and pounds thinner instantly. Ideal for a variety of training conditions.