The sidi kaos air cycling shoes offer everything followers have come to expect from sidi with a high quality fit and technically advanced design the sidi shoes feature a vent carbon sole with air intake that provides more rigidity than a standard nylon sole soft instep 3 and the tecno 3 push closure system provide a customised and adjustable fit for optimum comfort soft instep 3 system this system is a wide anatomically curved strap combined with a soft thermo formed eva pad that distribu