NIKE Womens Free RN Running Shoes Blue Glow/Racer Blue 831509-404 Size 8.5 synthetic-and-mesh Rubber sole Flywire cables integrate with the laces and wrap your arch for an adaptive, supportive fit. Plush foam and mesh tongue for breathable comfort Midsole flex grooves provide greater forefoot flexibility Waffle outsole for durability and great multi-surface traction Reflective details enhance visibility in low light