Ergo Grip high-density reinforced nylon outsole provides stiffness and support; Velcro straps for a quick and easy fit; Synthetic Leather for easy maintenance and durability; Nylon Mesh upper for extreme breathability and super lightness; Cleat openings under sole are compatible with SPD cleats; Visual display for cleat's position for an accurate fit; Reflective stripe for security and better visibility; Removable aluminum studs for maximized grip; Ergo Grip studs provide a better traction off the bike under extreme conditions.