This easily adjustable back brace contours to the unique shape of your torso and back for a customized fit that can relieve lower back pain and improve spinal stability. Made by Bell-Horn, manufacturers of orthopedic devices since 1842, the brace has a patented pulley system that allows it to contour to wider areas around the hips and narrow areas around the torso, ensuring consistent, proper compression from vertebra L1 to L5. You can adjust the tension of the brace with one hand; simply pull the cord and fasten it to the front of the brace when your preferred level of support is achieved. The pulley system exerts 5X greater compression than a typical back brace for superior spinal support. The flexible, 1/4"-thin brace can be worn under clothing and won't inhibited movement while you perform everyday activities. Waist sizes (see the Determine Size tab below) S, M, L, XL, XXL, or XXXL. 11 1/2" W x 9" H x 1/4" D. (12 oz.)