NATURAL RIDE. EVERYDAY COMFORT.Flexible and lightweight, the Men's Nike Flex Experience Run 4 Premium Running Shoe delivers a perfect balance of comfort and natural movement through its minimal upper design, resilient midsole and hexagonal flex grooves.FEATURES Single layer mesh and no sew overlays give lightweight support. Resilient foam midsole is durable enough to double as an outsole. Outsole hexagonal flex grooves promote maximum natural motion. Waffle outsole pistons help cushion impact and add responsiveness. Heel to toe offset is 7.2mm.