F.A.S.T. Technology uses brilliant design and ingenuity to provide a rebounding heel that encloses the foot after entry, allowing you to put your shoes on in a split-second. Please click for a video about KIZIKs adjustment features. Expertly crafted from rich leathers for long-lasting durability, KIZIK created the Miami, a sporty sneaker that modernizes footwear for the perfect blend of fashion and functionality. Full-grain leather or suede upper with perforated detail. Features F.A.S.T. Technology enabling a hands free, POP ON experience. F.A.S.T. creates a smooth rebounding heel using an aerospace-grade titanium wire. Custom instep adjustment allows you to tighten or loosen the fit using strips alongside the tongue. Tongue stabilizer eliminates foot movement and improves stability. Generously cushioned, contoured leather footbed. Rebounding rubber heel and outsole. Imported. Measurements: Weight: 11.99 oz Product measurements were taken using size 8.5, width M. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.