Barsty Men's Buttocks Thong Hollow-Out Thong Elastic Smooth Underwear 15% nylon Note:Asian size is smaller than US/EU/UK size so please check your measurements to make sure the item fits before ordering. US Small=Asia Medium (Waist: 27.5"-30.7") US Medium=Asia Large (Waist: 29.9"-33") US Large=Asia X-Large (Waist: 32.3"-36.2") US X-Large=Asia 2X-Large (Waist: 34.6"-39.4")