Say hello to supreme energy return. addias remade their high-energy running shoes with a 360o fit improvement to support female runners. The Ultraboost 22 has a narrower heel fit and lower instep curve to reduce heel slippage and help avoid blisters plus the medial outsole pattern has been refined for a smoother ride. Throw in the foot-hugging adidas Primeknit and incredible energy return of Boost and you get an ultra-comfortable shoe for any distance.