Ultra Boost Uncaged Shoes Shoes that deliver a light, energy-packed ride. Remember what that best-ever run feels like in these shoes built with ultra-cushioned boost™ and a foot-hugging upper.A revolutionary midsole delivers maximum energy return and doesn't pack down over time. A cage-free adidas Primeknit upper adapts to the changing shape of your foot through the gait cycle and delivers a clean, minimalist feel. The elastic STRETCHWEB outsole flexes to adapt to the way your foot hits the ground. Runner type: neutral adidas Primeknit upper wraps the foot in adaptive support and ultralight comfort boost™ is our most responsive cushioning ever: The more energy you give, the more you get STRETCHWEB rubber outsole flexes underfoot for an energised ride TORSION® SYSTEM between the heel and forefoot for a stable ride; FITCOUNTER moulded heel counter provides a natural fit that allows optimal movement of the Achilles Continental™ Rubber outsole for extraordinary grip in wet and dry conditions Weight: 280 g (size UK 8.5) Midsole drop: 10 mm (heel: 29 mm / forefoot: 19 mm)