Feel good, run fast, achieve more. It's a cycle. Add agility to your run with the Ultraboost 23. The lightest and most responsive Ultraboost yet, it also has a smaller footprint than previous versions. The magic lies in the Light BOOST midsole—the next generation of adidas BOOST with even greater energy return. This pair is specifically tailored to women's feet: a narrower heel fit and lower shaft curve are designed to reduce heel slippage and blisters. About the model Light BOOST Linear Energy Push System Standard last Textile lining adidas PRIMEKNIT+ textile upper Lacing Continental™ rubber outsole The yarn upper contains at least 50% Parley Ocean Plastic and 50% recycled polyester. It produces at least 10% fewer emissions per pair than the previous version.