Inspiration that transcended the ring, empowerment that stretched beyond sports & a legacy that will live forever: The UA x Muhammad Ali collection celebrates the Greatest Of All Time. Synthetic leather upper with snug, bootie-like construction for comfortable support Adjustable strap provides a secure fit Perforations throughout upper for enhanced breathability & ventilation 4D Foam sockliner moulds to the shape of your foot, eliminating slippage & providing ideal underfoot comfort Heel structure provides dynamic stability with an alluring design TPU injected heel clip provides a stable platform for stability during strength training & lifting EVA midsole delivers a lightweight & responsive ride Webbed rubber outsole moulded with thin polyester reinforcement, allowing weight reduction while maintaining traction & durability Added rubber pods for durability & grip where you need it most Offset: 6 mm Weight: 345g.