NIKE Men's Free 5.0 Running Shoe Cool Blue/Wolf Grey/Black Size 13 M US mesh New hexagonal flex grooves let your foot move more naturally. Flywire-reinforced Knit mesh upper provides great ventilation and supportive fit. Anatomically shaped heel promotes a more natural footstrike. Nike Free Phylite midsole doubles as an outsole for lightweight cushioning, durability and reduced weight. No-sew overlays throughout provide support and durability without added weight.