Special Technology Protection - The Zion 2 is the first shoe to feature our new larger Air Strobel unit in the heel. Zoom Air cushioning under the forefoot provides springy, responsive support. Sensation - Encapsulated Air-Sole unit in the heel provides lightweight cushioning for on and off the court. Containment - Secure your stance with the new hook-and-loop forefoot strap. It lets you harness your full mobility without sacrificing any movement to slide. An adjustable strap up top helps lock your foot in place while a firm midsole supports high-paced play. A wider outsole provides extra stability--perfect for playing on outdoor courts. The Zion 2 has more Air cushioning than its predecessor, so you'll get into the clouds easier and land softer.