The back brace relieves low back pain, including strains/sprains and moderate disc and arthritic conditions. It consists of eight flexible steel springs that work together for enhanced lumbar support. The tapered cut fits better around the ribcage for a more proper and comfortable fit. The 9" elastic band wraps around the waist, then a second 4" outer elastic straps provide tension adjustment. Constructed with lightweight, breathable fabric that can be worn all day long. Fits waists 28" to 50".