Feel what it's like to power every step with the lightest Ultraboost ever – the new Ultraboost Light. Say hello to the Light BOOST midsole, the latest generation of adidas BOOST. A unique molecular design makes Light BOOST the lightest BOOST material yet, producing at least 10% fewer emissions per pair compared to previous models (see the FAQs below for more info). The women's model also features a narrower heel and a flatter instep to reduce heel friction and blisters. Get the best in cushioning, comfort, and responsiveness for top performance.