Material: Nylon, polyester. This sport padded shirt made of elastic material, it will be a bit tight for the first time, but then it won't be all the time, because wearing and washing several times will make the clothes slightly looser. Washing tip: Don't washing it in the machine or soak in the water for a long time,just let it natural dry Attention : Before your buy,Please check the size chart in the picture and choose the right size. Or you can tell us your chest, height and weight. We will help you choose the fit size.