adidas Feel good, run fast, do better. It's a cycle. Add bounce to your run with the Ultraboost Light running shoes. The lightest and most responsive Ultraboosts yet, they're also made with a lower footprint than previous versions. The magic lies in the Light BOOST midsole, a new generation of adidas BOOST with even more energy return. This pair is specifically tailored to the female form, with a narrower heel fit plus lower instep curve designed to reduce heel slip and blisters.