SILKWORLD Men's Boxer Briefs Stretchable Underwear Pack of 7 Material:94.9%Bamboo fiber + 5.5% spandex Machine Wash or Hand Wash Flex waistband with strong stretch Perfect clipping makes it nice and breathable to wear Soft material that makes you feel very comfortable Because of the Asian size is about 1 size smaller than US size.For example: usually the Asian Tags "L" is equal to the US Size "Medium", and our item tag is printed in Asian size only. When you receive the item,please feel ok, it is just your size