SEOBEAN Men's Sports Gym Training Fitness Short Pants (Medium/28-30Inch, 2763 Blue) 85% Polyester, 15% Spandex Hand wash ONLY,slightly,cold water The size for all underwear products are asian size. Please pay a attention before you make order. If you shopping the underwear from U.S.A or EU brands,should be choice one size up. Comfortable and sexy