DESIGN: PowerZone Technology for better ankle support and stability Boa(R) L6 micro-adjustment and reversed hook-and-loop strap HRS-400 anti-slip membrane reduces power loss IN-SHOE COMFORT: Patented Carbon Air Lite composite extremely ventilated outsole Bounded upper all seamless for comfort to prevent pressure points Integrated double X-Comfort Zone1 technology prevents numbness and accommodates multiple foot widths Ventilated IceFil insole with Ergo Air system