The sidi kaos carbon cycling shoes deliver all the standard sidi details with a high quality fit and design the sidi shoes feature a millennium 4 carbon composite sole that provides more rigidity than a standard nylon sole soft instep 2 and the tecno 3 closure system provide a customised and adjustable fit for optimum comfort ad soft instep 2 system this system is a wide anatomically curved strap combined with a soft thermo formed eva pad that distributes pressure evenly over the ins