Jockstrap It's in the fabric: Inspiring Denim underwear. If you're not scared to enter a new fashion territory has you covered. The Jeans Jockstrap brief features a denim brief cut front with a classic jockstrap back. Made from cotton, polyester elastane fabric, this jockstrap has the vinyl printed logo, thermal embossed on the elasticated waistband. Choose Jeans underwear if you want to make more of a statement.