Adjustable Back Brace, One Size. This adjustable back brace provides firm, comfortable support to help relieve back pain. Ideal for back strains and sprains, moderate disc and arthritic conditions, sciatica, muscle spasms, chronic unstable lumbar spine, and strains of sacroiliac area. Lightweight, breathable fabric for all-day wear. Eight supportive steel springs conform to your back and provide firm lumbar support. Tapered cut provides a comfortable fit for men and women Main elastic band is 9 high and creates broad support Second outer elastic straps are 4 high and allow for adjustable tension. Fits waist 71 - 127 cm.