Size:M: Fits waist circumference 60-75cm 23.6"-29.5".L: Fits waist circumference 75-90cm 29.5"-35.4".XL: Fits waist circumference 90-100cm 35.4"-39.4".XXL: Fits waist circumference 100-120cm 39.4"-47.2".This special back support brace is the most suitable due to its unique double pull design, while retaining a non-bulky or heavy feel.This product is made of polyester fiber, heat retention and great support with a non-stretchable back piece and fin supports along the back.On top of that are two criss-cross stretchable and sleek straps that press the neoprene fabric further to the body for better support and at the same time retaining the flexibility on the sides, so that the wearer does not feel any kind of discomfort.Back conditions like sciatica, slipped disc, muscle spasms and pains associated with back conditions like herniated disc are effectively alleviated by this very effective double support mechanism. Moreover, this belt will help reduce movements involving twisting and sudden bends also recommended for persons involved in work related to lifting heavy objects.Material: Polyester, Spandex,Polyester fiberPackage:1Pcs Lumbar Support BletIDEAL FOR DAILY WORK AND LIFE:The supportive abdominal binder is a must-have for many people during everyday activities, e.g. some exercise like weightlifting, gym workout, running or some long time sitting standing working duties like truck drivers, warehouse workers. DUABLE AND VALUE FOR PRICE:Reasonably good price for a durable lumbar support belt. It's a multi-functional tool for back support, posture correction, waist trainer and body shaper. ADJUSTABLE AND ERGONOMIC FIT:The 4 plastic stays are designed to fit the body's natural curves, which helps stabilizing your spine. The adjustable wraps with strong velcro help adjusting to the right size and provide a snug fit to reduce the risk of injury caused by strain from heavy lifting. STRONG SUPPORT FOR LOWER BACK PAIN RELIEF:With 4 curved stays and extra elastic braces, the back support belts could provide a combination of support, compression and superior stabilization. Wear it and you'll immediately feel relieving pain of scoliosis, herniated disc, sciatica and arthritis, etc. LIGHT-WEIGHT AND BREATHABLE:Made of breathable material and mesh strap, the lightweight back brace is very comfortable.