SIDI GENIUS 6.6 Carbon Lite Womens Shoes Upper: Vernice Microfibre & Nylon Mesh Sole: Carbon Lite Sole Soft Instep 2: The anatomical & comfortable strap, placed on the top of the foot & coupled with a soft & thermo-formed material, will increase comfort & performance. It distributes pressure evenly over the arch area, adjustable from both sides to achieve the perfect center position. The system eliminates the need for the High Instep Extender. The Soft Instep Closure System is serviceable & replaceable Caliper buckle: The micrometric closure called &8220; Caliper buckle” is adjustable by lifting the central buckle. In order to completely open, lift together both side buckles, or push the center button to slightly loosen one tooth at the time. The system is also adjustable during a race. High Security Velcro: High security Velcro straps with integrated locking polymer teeth, that engage onto each other when the strap is closed. This feature makes the clo