SILKWORLD Men's Active Performance Boxer Brief Pack of 4 Black US Small Material: 95% Cotton 5% Elastane (soft comfortable version of spandex) U Contour pouch provides support,body will great fit,not too baggy and not too constricting. Thin underwear for a slim silhouette,breathable,stretches and forms Cotton stretch,flexibility microfiber waistband Machine wash cold. Do not bleach. Because of the Asian size is about 2 size smaller than US size.For example: usually the Asian L is equal to the US Small, and our item tag is printed in Asian size only. When you receive the item,please feel ok, it is just your size