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