Knee pads and supports protect a worker's knees, minimize fatigue and support muscles and tissues. Knee pads consist of a molded plastic kneecap and a flexible sleeve lined with foam or gel pads for cushion. The kneecap often has ridges to prevent sliding when working on hard surfaces. Knee supports brace a worker's knees during repetitive tasks, heavy lifting and kneeling. They help knees heal after strains or sprains and relieve symptoms of arthritis.