adidas Ultra Boost ATR Running Shoes - AW16 Primeknit - Engineered to naturally expand with your foot while you run to give you a more comfortable fit and help reduce irritation. TPU Cage - Provides a supportive feel. Water Layer and Mudguard - For protection during runs in wet conditions. BOOST Midsole - Provides significant energy return through the midsole's springy response as well as a substantially cushioned ride. STRETCHWEB - Adapts to the ground for stability and work strategically to optimse the unique properties of Boost from touchdown to push-off.