The ultimate running shoe, complete with maximum cushioning and extreme flexibility. Lightweight foam package delivers ultimate comfort, dynamic support and enhanced flexibility. Open top mesh for ventilation and breathability. Cushlon foam with forefoot and heel articulated Air-Sole units provide plush comfort and a smooth ride. Waffle skin outsole with a BRS 1000 carbon rubber heel with environmentally preferred rubber throughout for durable, lightweight traction. Wt. 13.4 oz.