Features: 85% Polyester / 15% spandex.Cool in Summer and Heat retention in Winter PERFECT FABRIC PROPORTION:made of high quality Dacron and spandex,light,breathable,stretchy and comfortable,no pilling and no deformation. PRACTICAL and DURABLE:perfect for casual wear,gym,workout,basketball,running,jogging,bodybuilding and wear it as a cold weather undershirts PROFESSIONAL ATHLETIC SHIRTS:the compression shirts can provide good compression so as to minimize muscle bouncing,jiggling during exercise MULTIFUNCTIONAL:not only can wear it for workout,also good as a thermal baselayer under outwears in cold weather Made of high quality Dacron and spandex,this compression shirts is breathable, comfortable and skin-friendly The scientific fabric proportion makes this long sleeve shirts have a high elasticity and will perfectly demonstrate your muscles Why you need a compression shirts during workout? The muscle tank top can provide good compression so as to minimize muscle bouncing,jiggling during exercise,and wick away your moisture The advanced sewing technology makes sure the roll line not easy to crack even doing high intensity exercise,very durable Not only can wear during daily exercise or workout,also can perform as a thermal base layer under your outwear,especially in cold weather. Compression shirts will help control your blood flow and hold your warm better than normal undershirts Suitable for all seasons (training, baseball, basketball, soccer, American football, NFL, Squat, weight training, cycle, yoga, rashguard, skiing, snowboarding, all weather sports) The tag size is Asian size and normally runs small than US size,please refer to the size chart to choose a suitable size