Under Armour Break Thru Slider - Boys' Grade School One of Under Armour's top baseball sliders, the Break Through, is loved for its Signature Moisture Transport fabric that continuously pulls moisture off the skin. HeatGear® fabrics make it more advanced, reaching its peak potential from 75-100º. They're double layered for durability and hold a mesh cup pocket. For the perfect combination of protection, weight, and durability, find the hyper green accents of the UA Break Through Slider. 84% polyester/16% spandex. Imported.