The sidi wire carbon vernice cycling shoes deliver ultimate performance without compromising comfort and is versatile for both road and mtb cleats tecno 3 push system an adjustable heel retention device and a soft instep fastening device will keep feet fully supported and snug perfect for riders who want efficient power transfer with the optimum fit rk soft instep 3 system this system is a wide anatomically curved strap combined with a soft thermo formed eva pad that distributes pre