Godsen Men's Swimming Boxer Briefs Shorts 80% Nylon / 20% Spendex Machine washable 80% Nylon / 20% Spandex Soft, fabric covered waistband is smooth against the skin boxer-briefs closure Exposed elastic comfort flex waistband moves with you 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.