The quad-burning box jumps that you bring your 窶忤hy窶 into focus. The up-against-the-clock sprints that make you dig deeper than ever before. The sweat-soaked super sets that leave you grabbing your shorts. This is what you live for: the struggle, the moment of truth, the breakthrough, the transformation. Designed for quick bursts of force, heart-thumping tempo changes and fast-paced workouts, this the acclaimed training shoe that can help push you to new Hiit heights. 100% Polyester.