adidas Ultraboost Men's Running Shoes Core Black/Active Red : You've experienced boost(TM)technology, now with adidas Ultra Boost running shoes you'll get 20% more for consistent performance and an endless supply of light and fast energy. These shoes also feature a Stretch Web outsole that provides sufficient grip and elastic stretch to help harness your energy without restrictions. The soft, bootie-like fit adds unmatched comfort and a sleek profile. Upper: Engineered PRIMEKNIT mesh with various types of mesh in different areas of the foot provides a forgiving yet snug fit that allows natural expansion of the foot External heel counter provides optimal heel fit and running comfort. Flat laces reduce irritation. Midsole: BOOST(TM)offers supreme durability with a soft and comfortable touchdown and a smooth transition to the forefoot. TORSIONA(R) SYSTEM delivers lightweight arch support that allows the forefoot and rearfoot to move independently for better surface adaptation and stability. Ultralight sock liner adapts to the foot for a custom and comfortable fit. Outsole: STRETCHWEB rubber outsole provides flexibility to harness energy without restrictions.