The adidas Ultra Boost 20 features a black Continental outsole and Boost midsole. The midsole for these sneakers also features 20% more Boost, which offers more comfort, flexibility, and durability and allows the wearer to absorb and return more energy when running. The adidas Primeknit upper provides a supportive fit, while the heel is made with soft elastane material for comfort. Tailored Fiber Placement technology offers stitched-in reinforcement as well as a superior fit and lightweight feel. Please note yellow discoloration as noted above in pictures. Worn lightly. Well taken care of