The Strike is the lightest, strongest underwear Saxx makes. Their ergonomically shaped panels wrap around the large muscle groups in the leg to support power and strength while the stretch weave lends breathability to your run or climb. All Saxx undergarments feature their trademark BallPark pouch. 80% recycled polyester / 20% spandex. Order Small for waists 30-32, Medium for waists 33-35, Large for waists 36-38, and X-Large for waists 39-42.