Rollators are rolling walkers with two, three, four, or even more wheels. Wheeled walkers come in many different shapes, sizes, and configurations. Wheels come in different sizes and materials; some that turn or swivel for maximum maneuverability and some that allow for use on various terrains. Common rollator features are hand brakes and an adjustable seat with or without a basket underneath. Other accessories may include arm rests, cup holder, meal tray, or storage bag.