A variant of the walker is the wheeled walker, also commonly called a rollator.  It is a walking frame with wheels. Rollators are typically more sophisticated than conventional walkers with wheels. They are adjustable in height and are equipped with a seat and sometimes with a basket; with the use of modern materials, they are light-weight yet sturdier. Modern wheeled walkers may also provide a back against which a person can lean. A particularly important part of a rollator is hand brakes mounted on the top of the frame that can be lifted or pushed downward to stop the wheeled walker at once. The brakes can also be used in maneuvering the rollator; when turning, the user can brake on the side being turned towards in order to achieve a tighter turning radius