Arm rests are pieces of furniture that are designed to provide support and comfort for the arms and elbows of a person sitting in a chair. They are typically made from materials such as wood, metal, or plastic, and can be found in a variety of shapes and sizes. The term 'arm rests' can also refer to SLINGS and SPLINTS, which are medical devices used to immobilize and protect injured arms and wrists. SLINGS are typically made from fabric and are used to support the arm while SPLINTS are rigid structures made from materials such as metal, plastic, or fiberglass, and are used to keep the arm in a fixed position.