The Surge is an ankle boot with a contrasting leathers. This style has an inside zipper as well as gore on the sides. The Surge features padded technical lining which provides comfort and absorbs moisture. Naot's removable, anatomic cork and latex footbed is wrapped in pampering suede and molds to the shape of the foot with wear. The Shell Collection features a 1.5'' polyurethane sole which is extremely lightweight, durable and slip resistant. Material: Leather, Suede, Cork, Latex, Man Made.