A cast supporter is a device used to support a broken bone or other injury while it heals. The term 'cast supporter' can refer to three different items: a SLING, an EASEL, and a TEE. A SLING is a piece of fabric that wraps around the body and supports the injured area. An EASEL is a metal frame that is placed around the injured area to provide additional support. Finally, a TEE is a type of brace that is placed around the injured area to provide stability. All three of these items are used to help immobilize the injured area and provide support while the injury heals.