Upgrade (X) 3 Introducing (X) for superior performance. Life can feel like an extreme sport and so can finding the perfect pair of underwear that’s why we’ve created the (X) Line. Need an underwear upgrade times 3? No sweat. Constructed in ultra-lightweight, cooling fabric, (X) Sport is performance-ready. Featuring a streamlined microfiber waistband and a clean turn back hem. Our temperature-regulating fabric wicks moisture away from the body for a supremely comfortable experience