SEOBEAN Mens Super Low Rise Sexy Swimwear Trunk Boxer Brief Swimsuit 2116 82% Nylon,18% Polyurethane hand wash ONLY,slightly,cold water The size for all swimwear products are asian size. Please pay a attention before you make order. If you shopping the swimwear from U.S.A or EU brands,should be choice one size up. S: 25-28in/63-71cm M: 28-31in/71-79cm L: 31-34in/79-87cm