K4 Lightweight Wheelchairs by Medline , at only 33 pounds offers a durable yet lightweight wheelchair. The Basic K4 is not only lighter but its a foldable wheelchair style to make life easier, especially when its carried up and down stairs and lifted in and out of a trunk. Its also lighter to push and has smooth-rolling, flat-free tires which are particularly helpful for the caregiver. Its made with a hard-wearing tig-welded wheelchair frame with gray powder coat finish to stand up to this rigorous use. The K4 Basic Lightweight Wheelchair offers comfortable and tough nylon upholstery.