Backplate and Wing

Another way to control your buoyancy is by using a backplate with a harness and a wing. The backplate is usually made of stainless steel or aluminium. A harness made out of nylon webbing is threaded trough the backplate to make sure you can actually wear the plate on your back. Attached to the backplate is a wing which is basically a horseshoe or donut shaped plastic bag with very sturdy fabric on the outside. The wing can be filled with air to compensate your buoyancy just as what you would do with a BCD.