NIKE Womens Free RN Running Shoes Dark Grey/Pink Blast 831509-006 Size 7.5 synthetic-and-mesh Synthetic 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