YuKaiChen Men's Bulge Enhancing Bikini Underwear Sexy Low-Rise Briefs Material:95%Polyester+5%Spandex Machine wash cold Traceless technology construction and fabric Dries quickly if you do sweat in them Note:Asian size is smaller than US size.Please check your measurements to make sure the item fits before ordering. Size:M(25"-28")=US size XS;L(28"-31")=US size S;XL(31"-34")=US size M;XXL(34"-37")=US size L.