Olyer Men's Sexy Underwear G-string Thongs for Men 100% Cotton Material:Pure Cotton Clearing mite antibacterial effect, good affinity to skin, breathable moisture, not out of shape,Thin elastic waist and leg trim. This underwear have carry buttock effect, because of hollow out design and has good permeability, breakthrough embodies the design concept: sex appeal is a kind of attitude. Size: M: Waistline-27"(-31'' stretch )L : Waistline-29"(-33'' stretch )XL :Waistline-31"(-35'' stretch ) Hand wash ONLY,slightly,cold water.