The Grid Motion 6 brings a more comfortable and sleeker looking upper than its predecessor. With more full grain leather in the forefoot, and stretch zones for the first and fifth metatarsal heads you will enjoy a better and more comfortable ride. Midsole Technologies: EVA midsole for responsive cushioning Rearfoot Grid for Stable Cushioning Forefoot HRC for dynamic toe-off HRC Strobel Board for foot-in comfort Dual density for pronation control Midfoot Bridge for support. Outsole Technologies: XT900 rubber compound heelstrike XT600 rubber compound rearfoot XT600 rubber compound forefoot