The Therall Heat Retaining Back Support is ideal for back strains and sprains, moderate disc and arthritic conditions, sciatica, muscle spasms, chronic unstable lumbar spine, and strains of sacroiliac area. It is constructed with four-way stretch material for light compression. Sizing: Measure circumference around lower back/upper hips Small 22-33 Medium 32-42 Large 41-48 X-Large 47-54
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