Footbed is covered with 100% polyester terrycloth and terry upper/lining. Elastic Backstrap for secure fit. Podiatrist-designed, biomechanically contoured arch support and deep heel cup to realign your stride and help prevent moderate to excessive pronation. Flexible EVA midsole absorbs shock, reducing stress on feet, ankles and knees. Footbed is treated with anti-bacterial, odor-resistant Ecofresh.