The back brace contains 4 aluminum memory supports that are four times harder than commonly used PP strips and 2 steel springs placed along the waist side, offer 360° stronger vertical support for the lower back, prevent excessive rolling of muscles and decrease pressure on your discs. The back brace is made of 4-way stretch material, 3D fabric technology with different levels of compression, for superior fit, breathing and comfort. The inner layer is made of velvet fabric, which gives a silky touch similar to a baby's skin, for dressing internally. The back brace with 2 elastic straps is designed to add extra compression around the lower back to prevent back injuries from lifting weights, long standing or sitting, doing housework, working, etc. Pain relief from waist muscles, herniated disc, sciatica, scoliosis, etc. the back belt. 2 silicone non-slip bands are designed on the 2 sides of the waist, prevent the waist support belt from rolling up when sitting, bending or performing other activities. 1.5''*3.7'' wide touch fasteners of 2 elastic straps provide strong adhesion far beyond your expectations, made of PVC material which is usually used for baby clothes, will not scratch their skin or damage their clothes. S: fits waist circumference 65-80cm/25.6-31.5 inches M: fits waist circumference 80-100cm/31.5-39.3 inches L: fits waist circumference 90-110cm/35.4-43.3 inches XL: fits waist circumference 100 to 120 cm/39.3 to 47.2 inches 2XL: fits waist circumference of 120-140 cm/47.2-55.1 inches 3XL: fits one circumference2 silicone non-slip bands are designed on the 2 sides of the waist, prevent the waist support belt from rolling up when sitting, bending or performing other activities. The back brace with 2 elastic straps is designed to add extra compression around the lower back to prevent back injuries from lifting weights, long standing or sitting, doing housework, working, etc. Pain relief from waist muscles, herniated disc, sciatica, scoliosis, etc. the back belt. The inner layer is made of velvet fabric, which gives a silky touch similar to a baby's skin, for dressing internally. The back brace is made of 4-way stretch material, 3D fabric technology with different levels of compression, for superior fit, breathing and comfort. The back brace contains 4 aluminum memory supports that are four times harder than commonly used PP strips and 2 steel springs placed along the waist side, offer 360° stronger vertical support for the lower back, prevent excessive rolling of muscles and decrease pressure on your discs.