Ultra-lightweight external foot support. Layered materials ensure a secure grip on the foot while maintaining lightness and freedom of movement. Knit sock adjustment allows easy on and off and a snug fit. The seamless Knit sock design delivers a precise fit and a wide range of foot mobility. NIKE FLYKNIT engineered for unparalleled fit and support. NIKE SKIN provides exoskeleton-like support for the ankle and midfoot. Split sole enhances flexibility and stability during foot placements.