Spring/Summer 2017 Seamless Upper delivers improved mid-foot fit and the Anatomical Forefoot Shape allows for natural forefoot splay and foot swelling. With a 1:1 Energy Foam rim & core midsole construction puts soft cushioning under your entire foot ESS forefoot rock plate protects feet against stone bruising and rock push-through. Dynamic Offset: 4mm at initial contact to 7.5mm at mid-stance Aggressive, multi-directional carbon rubber outsole offers superb traction and abrasion resistance. Heel Stack Height: 30mm