The ladder is made from aluminium and has a post on either side. There is a steel wire rope running along the ladder for fall protection. The person climbing the ladder wears a safety harness connected to the rope. This connection consists of a detachable clamp that slides freely up and down over the rope, except when the climber falls. In that case, it blocks. There is an integrated shock absorber in the connection between clamp and harness. The clamp is detachable so the person can return to the ladder on another height as where he left it. In the meantime, he keeps the harness and the clamp with him. Resting along the ladder is possible by hooking a short rope from the harness to the ladder.