Keep up the pace in this high-performance running shoe boasting lightweight construction and an adaptive Primeknit upper. It's built from the ground up with a grippy tread fused to layers of targeted cushioning that provide powerful energy return and forward propulsion, with a lace-up bungee system means a secure fit. Lace-up style Primeknit upper wraps every step in flexible, ultralight support Boost™ cushioning rebounds quickly from every step, stride or jump Torsion® System construction provides a smooth transition from heel strike to midfoot Removable insole Textile and synthetic upper/textile lining and sole Imported