Paul Kevin Mens Sexy Underwear The label size is our size, Not US Size, pls pay attention to the product images and description, find the right size. If you are not sure the size, please buy one size bigger than your regular size. Size M, Waist: 25-34 inch Size L, Waist: 27-35 inch Size XL, Waist: 29-37 inch Example: One man height: 5'6", weight: 121-132 lbs, the best option is size L.