The Nike Air Max Alpha is vault-inspired design with the newest in Max Air technology. The upper is innovative synthetic overlay technology and a plush inner sleeve delivers lightweight, flexible support with seamless comfort. New heel-specific maximum Air-Sole unit technology in the midsole provides supreme comfort and impact protection. Phylon forefoot with flex grooves allows flexibility. Removable insole. Durable Nike Regrind outsole. Wt. 12.4 oz.