XSHANG Mens Muscle Tank Tops Graphic Workout Sleeveless Shirts 5% spandex 95% Cotton/ 5% Spandex, super soft, stretch-fit and dry quickly and retain shape. PLEASE read the Size Chart in the detailed picture on the left carefully,if you are not sure of the size, ONE SIZE UP is a good idea Suit for casual/sports wear(gym athletic) or work out favorite. Our size is not Amazon's standard size,please kindly refer to our size. Fitness and elastic, close-fitting with nice material and variety of colors. Original XSHANG Brand, Professional Sport Tank Top and T-shirt manufacturer.