Specification: Material: Polyester, PVC, Aluminum, Silicone Size: Waist circumference measured at navel level. M (waist circumference adjustable about 78-82 cm/ 30-32") L (waist circumference adjustable about 82-94cm/ 32-37") XL (waistline adjustable around 94-102cm/37-40" ) Wide: Both are 21 cm/ 8.2" Color: Black Use: Pain Relief Applicable People: Unisex Parts List: 1 x Lower Back Brace A?AlStrengthening FixedA?a?The lower back brace contains 4 memory aluminum struts, the support force is 4 times that of PP struts, and 2 steel springs are placed on both sides of the waist to provide 360A more robust support for the lower back. A?AlBreathable MeshA?a?The back support belt has breathable air mesh, is made of 4-way stretching technology, which is light in weight and gives you the ultimate silky touch of skin when worn under the clothes. It is very suitable for back surgery recovery. A?AlStrongest Extra SupportA?a?The back support elastic belt is designed to be 4 times the strength of the elastic force, which can quickly increase the extra compression force around the back. A?AlHigh-Quality MaterialA?a?Two silicone anti-skid belts are designed on both sides of the waist to prevent the back from supporting upwards when sitting, bending, or doing daily activities. It is made of PVC material and is usually used for baby clothes. It will not scratch your skin or damage your clothes. A?AlPain ReliefA?a?The lower back brace can relieve arthritis, intervertebral disc herniation, sciatica, spinal stenosis, scoliosis, ankylosing, and spondylitis caused back pain. It can also reduce the weight of standing or sitting for a long time, playing golf, doing housework, gardening, Lower back pain at work, etc.