Convaid Cruiser 16" Adolescent-Teen size... light-weight construction yet it is strong enough to endure a 30 mph crash test! The stroller seat surface is oriented in space 30 degrees from the floor plane for posture management. Additionally the stroller seat to back angle adjusts in 5 degree increments for posture management. The Optional Heavy Duty Seat provides a seat and back reinforced with nylon stiffeners to prevent slouching and to provide an upright seating posture. Front stroller wheels swivel to provide lots of maneuvering in and out of tight places. User Target Height 50" (127 cm) to 68" (173 cm), "normal" age range estimate from 8 yrs to 18 yrs.