2-TONE SHIFT. The Nike Downshifter 9 blends closed mesh on the back that helps secure your foot during all-out sprints, with open mesh at the forefoot for optimal ventilation. Soft foam and flex grooves underfoot deliver a smooth ride. Open mesh at the forefoot lets cool air in and heat out. Closed mesh through the midfoot and heel provides structured support. Soft, smooth foam midsole cushions your stride. Tapered heel looks sleek and feels fast. Rubber outsole offers durable traction. Flex grooves let your foot move naturally.