Lightweight comfort meets propulsive energy return in the next-generation UltraBoost running shoe that pairs a soft knit upper and signature Boost" cushioning. Primeknit 360 seamless construction brings distraction-free performance at any distance, while supportive elements in the heel and sole promote neutral heel-strike to toe-off movement with every stride.True to size. Neutral. Offers enhanced foot motion via cushioned insoles and minimal stability features. Pull-on sock upper with adjustable lacing cage. Primeknit upper wraps your foot in flexible, ultralight support. Fitcounter molded heel allows natural movement of the Achilles. Boost cushioning rebounds quickly from every step, stride or jump. Torsion System cushioning provides a smooth transition from heel strike to midfoot.