Caliper Buckle The micrometric closure called "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 closure more secure and the strap becomes unmoveable. Soft Instep Closure System The SOFT INSTEP CLOSURE SYSTEM is a wide, anatomically curved strap combined with a soft, thermo-formed EVA pad that distributes pressure evenly over the instep area. The SOFT INSTEP CLOSURE SYSTEM is adjustable from both sides, to perfectly center the EVA pad over a high or low instep. The system eliminates the need for the High Instep Extender. The SOFT INSTEP CLOSURE SYSTEM is replaceable. MTB Competition Sole Has been specifically studied for this specialty, may be fitted with two toe spikes on the front for traction in difficult and muddy conditions. The toe spikes are sold separately. Microfibre Techpro MICROFIBRA TECHPRO is a microfiber PU Made in Italy. It is considered a highly technological and innovative, eco-friendly leather suitable for technical and sports products which require high performance levels. TECHPRO MICROFIBER incorporates features of resistancy, stability, lightness, water-repellency and eco-friendliness. TECHPRO MICROFIBER has a Hydro and anti-mold treatment, which eliminates the onset of molds and bacteria. TECHPRO MICROFIBER is Oeko-Tex certified, does not contain harmful substances and respects law restrictions.