Single-layer mono mesh upper creates a breathable, glove-like fit that is ultra soft and ultra lightweight. Flywire cables wrap the midfoot and arch for custom lockdown while Nike Regrind recycled no-sew overlays offer targeted support and stitch-free comfort. Collar foam molds to the ankle and guards against water absorption. Tongue is integrated to the medial side, wrapping the foot and opening on the lateral side for easy on and off. Full-length Phylon midsole for a lightweight, responsive ride. Carbon fiber midfoot shank provides stability and support when running over rough or uneven surfaces. Environmentally preferred rubber outsole with an aggressive traction pattern provides traction and durability on any terrain. Four-spike Pebax plate is shaped like a horseshoe for additional traction and increased speed. Anatomical heel is rounded to roll with the ground for a more natural range of motion. Flex grooves for a smooth, efficient stride. Includes 5/16" pyramid spikes and a wrench. Wt. 4.6 oz.