Feel the lightest Ultraboost ever and experience every step packed with epic energy – the new Ultraboost Light. Meet the Light BOOST midsole, the latest adidas BOOST generation. Thanks to a unique molecular design, Light BOOST is the lightest BOOST material yet. It also produces at least 10% fewer emissions per pair compared to previous models (see FAQs below for more details). The women’s model features a narrower heel and a flatter instep to reduce friction and blisters at the heel. Get the best in cushioning, comfort, and responsiveness for top performance.