Ubestyle Men's Athletic Fitness Compression Under Base Layer Sport Tank Top 90% Polyester +10% spandex, Machine Washable Super scalability, if you are a big muscle, get a bigger size than you normally wear Moisture Transport System sweeps away sweat and dries quickly Suitable for all sports indoors and outdoors,such like:running,basketball,cross training and etc Ubestyle size is smaller than U.S size, When you receive an different Asia tag,please feel ok, it is just your size