A breathable mesh upper - with stretch panel for midfoot support keeps your foot dry from sweat, but yet secure. Zoom Air units in the heel and forefoot with a full Nike Cushlon midsole for a supremely cushioned and responsive ride. Natural Motion engineered flex grooves - for enhanced flexibility and a smooth, efficient stride EVA strobel outsole with Duralon in the forefoot and BRS 1000 in the heel delivers the ultimate fit, feel and durability. Asymmetrical arch bridge - gives more support where it is needed meaning you are less likely to suffer from your arches collapsing or hurting.