At only fourteen pounds, the Convaid Vivo Wheelchair is one of the lightest children's wheelchairs available for purchase. It has an adjustable back seat and is economical. Useful for both teens and children, this wheelchair is compact-folding for simple car storage. With swing away footplates, adjustable back straps, maneuverable seat backs, and seat depth that is growable this wheel chair will fit growing children for a long time. The easiest way to determine proper seat width is to measure the widest point between knees and hips while the child is sitting comfortable and add several additional inches to factor in both comfort and growth.