A riders foot must be properly supported in order to most effectively transfer power to the pedal. *One critical aspect of this is arch support; an unsupported arch robs power, and increases fatigue and discomfort *The adjustability and performance of Giros SuperNatural footbed is available as an accessory fit kit *1 pair of footbeds with 3 different arch heights; small, medium, and large *Cycling specific design *Thin profile helps anchor the heel and keeps the foot as close as possible to the pedal *X-static anti-microbial fabric.