Walking boots for fractured ankles, sprained ankles, foot pain, and foot problems are available in a few different models. A pneumatic walking boot also called an air walker or an air cast is a facrture boot with an air bladder. The air bladder can be inflated or deflated to accommodate for swelling and to control compression. A range of motion foot boot has adjustable hinges to control ankle motion. A standard walker boot has fixed struts for protection and stability.