Improve your running performance and enjoy every moment. Run with these Ultraboost 23 running shoes. These lightweight Ultraboost shoes are highly responsive and have a lower environmental footprint compared to previous versions. The Light BOOST midsole is the new generation of adidas BOOST, featuring even greater energy return and an even lighter feel. Specifically designed for the female foot, these shoes have a narrower fit at the heel and a lower instep curve for a better fit.