XSHANG Men Muscle Camo Tank Tops Cotton Compression Sleeveless Shirts 5% spandex COTTON: 95% Cotton and 5% Spandex,very comfortable to wear and the color will not fade. FLEXIBLE: Comfortable fitness and stretch elastic Tank Top great for training, sports ,running or casual. Machine washable and very durable so dont worried that it will be pilling. Lightweight, dry fast and Multiple sizes, many colors for your options. NOTE:If you want to wear a little loose, please buy 1 SIZE UP. Our tag sizes are Asian sizes,please take our size chart as reference rather than Amazon size chart.