Nike Free 5.0 - Boys' Preschool The Nike FREE 5.0+ running shoe is designed to maximize the foot's natural range of motion while providing protection and cushioning for a smooth ride. Ultra-light Flywire technology provides superior support. Flex groove design enhances a natural range of motion. Phylon from the midsole combines with strategically placed rubber lugs on the outsole to offer traction and provide a durable and lightweight feel. 8MM offset delivers a cushioned, barefoot-like feel.