PERFORMANCE: Ideal for high performance training, sports & exercise, Incrediwear's body sleeves are worn by competitive and recreational athletes during and after activity to optimize performance and help prevent potential injury. SIZING: For the best lumbar support, measure at the belly button. Medium=24-29in, Large=30-33in, X-Large=34-37in, 2X-Large=38-44in, 3X-Large=45-53in, 4X-Large=54-60in. RECOVERY: Incrediwear's back braces for lower back pain can be worn 24/7 & are scientifically proven to increase blood circulation and optimize the body's healing process for improved recovery and muscle soreness relief. MATERIAL: The Incrediwear lower back brace can be worn during and after physical activity to provide added lower lumbar support, lower back pain relief and help with sore muscle recovery. ANTI INFLAMMATORY: Incrediwear back brace for women and men features wearable anti-inflammatory therapy signature fabric blend is embedded with semiconductor elements to increase blood flow to help accelerate recovery. Machine Wash.