Rare S size (equivalent to Japanese M size). Not sold in Japan. Made of cotton fabric, it feels good on the skin. Perfect for a reward for yourself, a gift for someone special, or a Christmas present. New, unused, and unopened. Although I have stored it carefully, there is damage to the outer box from the time of purchase, and there is some staining on the fabric of the underwear that corresponds to the quality check hole on the back of the box. I think the stain can be removed by washing, but please understand this before purchasing. Please note that we cannot accept returns or exchanges for new, unopened items. Please assume that there is damage to the outer box and staining on the underwear fabric that corresponds to the quality check hole. The images are of one of the items in stock. Please note that the product delivered may not be in the exact same condition. Calvin Klein CK jockstrap Men's underwear, underwear, sports innerwear Gym, training, present, split-butt, supporter Calvin Klein CK Men's Underwear Underwear Briefs Boxer Briefs Pants Shorts Sports Innerwear Sports Underwear Training Wear Gym Wear Fitness Athletic Running Workout Muscle training jockstrap jockstrap supporter athletic supporter sports supporter front opening low rise low rise pants underwear sports fashion men's fashion street set sale bulk sale new unused unopened authentic overseas model rare size S size small size gift present Christmas birthday gift