Dusishidan Men's Athletic Camouflage Compression Tank Top Slimming Body Shaper Elasticized Fabric 84% Polyester, 16% Spandex Quality breathable materials which transfer sweat and moisture faster from the skin to the outer surface of the fabric. Athletic look to boost your confidence to perform at your peak. Consistent compression to support your muscles, improve blood and oxygen circulation, and reduce excess motion. Size Chart: (Size S--Chest 30.7"-32.3") (Size M--Chest 32.3"-33.8") (Size L--Chest 33.8"-35.4") (Size XL--Chest 35.4"-37.0")