According to Sidas there are three different types of feet: feet with a high bow, feet with a normal bow (Mid), and feet with a low bow. Sidas has insoles for each type! Feet with a high bow need, besides comfort, reinforcement on the back of the foot, and stability. The solution? Sidas Winter 3Feet High! This insole has an aluminum coating for isolation and the gel pad offers optimal silencing during skiing or snowboarding.