Material :Polyester, Cotton,Neoprene,Elastic,Mesh Colth color:black size:S,M,L,XL,XXL High quality back support belt function: 1. Correct posture to keep your stature well 2. Reduce or ease lower back pain and fatigue 3. Can keep correct posture whenever you sitting, standing or working 4. Correct your spinal column to keep well 5. High quality material make it adjustable and easy to use 6. Men and women all can use it 1. If you are satisfited with our products and services, pls leave your positive feedback and 5 stars , and 5 stars for the detailed rating of your order . Once you show us the screenshot of both 5 stars, we will give you the DISCOUNT for your next order . 2. If you don't satisfied our products, pls contact us before you leave nagative feedback or do the detailed rating. We guarantee we will 100% solve any problem for you.