Yes, the saddle (seat) height can be adjusted. The saddle is attached to a seat post that slides into the bicycle frame. To adjust the height: loosen the clamp or bolt that holds the seat post in place using a wrench or quick-release lever, raise or lower the saddle to the desired height, and then tighten the clamp or bolt securely. The correct height allows the rider to sit comfortably with a slight bend in the knee when the pedal is at its lowest position.