Featol Adjustable Back Brace. Reduces back pain, Innovative adjustable design, prevents sports injuries, reduces strain on the lower back, enhances back support, breathable materials; Ideal for lower back, sprains, strained muscles and spasms; Size 3XL waist (inch) 47-55 (CM) 116-140; Made from 60% Neoprene, 20% nylon, 15% polyester, 5% polyethylene.