Specification: Material: Mesh fabric， fishline cloth， metal stays Function: Posture back brace relieve back pain Color: Black Size: S， M， L， XL Description: Fully adjustable with velcro. Adjustable and high elastic back braces， enhances the stability all around the lower back area and improves posture. Unqiue double pull criss-cross extra strength elastic strap can give you the extra shield of stability and support. Fish line mesh fabric， vented， breathable， comfort， handiness. With 4 strong and large metal stays， which are positioned around the lower back area to provides a high level of support. Help relieve pain associated with joint and back problems. Suitable for people who with back problems: Slipped disc， degenerative disc disease and Sciatica Suitable for: 1. People who has health problem like protrusion of lumbar vertebral disc， sciatica and/or lumbar hyperosteogeny. 2. People who always work sedentarily or in a prolonged standing position such as drivers or office workers. 3. People who want to contract abdomen slender waist or keep a toned body. Below crowd please use it cautiously: 1. Pregnant women and children please do not use this product. 2. Please stop using if you have a high fever or damaged skin. 3. Patients with acute soft tissue impairment， please don't use. 4. Please use with caution under the guidance of doctors: Patients with serious trauma， high blood pressure or any other disease. Package includes: 1 X Back Support