Light weight Aluminum frame is lightweight and strong. Composite wheels are lightweight and maintenance free. Both 18", 20" and 22" come with swing-away footrests. Comes with seat belt for added safety. Padded armrests provide additional comfort. Nylon upholstery is comfortable, lightweight and easy to clean. Back folds down for storage and transport. Aluminum casted back-release hinge allows back to fold down for easy storage and transport.