1.INSTANT RELIEF: Lumbar Back Braces work by supporting your spine and surrounding muscles during times of pain and injury. 6 built in steel support stays, provide for maximum lumbar support. Along the two side of spine, do not have positive contact with the vertebrae, focus on protecting the L4 L5 S1 Lumbar vertebrae. 2 nylon bars support the lumbar muscle in the waist to relieve strain and soreness 2.ADJUSTABLE PULLEY SYSTEM: Dual-layered compression belt with Velcro fastener, Adjust the back support to the exact position and pressure for your needs. Designed to allow natural movement while providing comfortable support 3.COMFORT YOU DESERVE: Made with breathable mesh fabric designed to be worn for extended use without excess heat buildup,making it comfortable to wear while working or movement. Comes in a black color and can be worn over or beneath your clothing.Detachable, Washable, Breathable, non-Neoprene, non-Elastic knit fabric. 5.CHECK SIZING CHART To make sure our back brace works perfectly for you, be sure to check the sizing chart and choose the proper size in the drop down menuDo not assume you know your size