Phylon midsole with Nike Shox columns are provided for responsive, lightweight cushioning. Blown rubber outsole lugs are provided for better cushioning and response. Considered design for high performance and low environmental impact. Nike Shox Turbo+ has enhanced cushioning and extended durability. The Inner sleeve fit construction is designed to provide a snug and secure fit. Nike cushioning system in the heel. Well-cushioned Phylon forefoot for a smooth and responsive ride.BRS 1000 carbon rubber and solid rubber outsole provides great durability. The Nike+ enabled allows you to insert Nike+ technology into the shoe to keep track of your progress. When placed under the sockliner of the left Nike+ ready shoe, the sensor measures your pace, distance, time elapsed and calories burned. This information is transmitted wirelessly to the receiver for real-time feedback. Nike+ sensor are not included with this product, and have to be bought separately.