Move with lightweight agility. The next best thing to going barefoot, the Sprint is our most popular women’s model with a lightweight, open design for versatility. A thin, stretch polyamide fabric upper follows the contour of the foot for comfort, and an adjustable hook-and-loop closure across the instep and around the heel provides a personalized, secure fit. The flexible, non-marking 3.5mm Vibram® TC1 performance rubber sole is razor-siped to enhance flexibility and grip on a variety of terrain.