Inside, the DRi-LEX® lining and removable DRYZ® footbed work together to keep your foot cool and dry. Below, the lightweight polyurethane midsole and rubber outsole combine to deliver flexibility where you need it most. Briar Leather Upper. DRi-LEX® Lined. Removable DRYZ® Footbed. Steel Shank. Polyurethane Midsole. Rubber Outsole.