Nike Flex Experience Run 4 Womens Running Shoes (10 B(M) US WOMEN, Tide Pool Blue/Blue Lagoon/White/Green Glow) mesh Rubber sole Shaft measures approximately 2.73" from arch Resilient foam midsole is durable enough to double as an outsole Single-layer mesh and no-sew overlays give lightweight support. Waffle outsole pistons help cushion impact and add responsiveness Outsole hexagonal flex grooves promote maximum natural motion