Sidi wire carbon air vernice shoes the anatomical and comfortable strap placed on the top of the foot and coupled with a soft and thermo formed material will increase comfort and 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 3 is serviceable and replaceable tecno 3 push system sidis new techno 3 dials in fit along the entire length