The bosun's chair derived its name from the olden days of saling ships; the Boatswain (or Bosun) was the petty officer on a merchant ship responsible for maintenance and related work; he was the most likely to ride a chair up the mast to work on the rig. Bosun's chairs are still used on sailboats today. They are also a key element in chair access work. The Window Cleaner sits on the chair and lowers himself down a building to clean the windows. The chairs can come with hooks for tools and buckets, padding and safety belts. A fall-protection harness must be worn at all times.