"Product FeatureHello Welcome to our store Fashion design,100% Brand New,high qualityQuality is the first with best service. customers all are our friends.Product Features100% brand new and high qualityRelieve that stress on your back and improve your posture. This back support is ideal for car seats and office chairs. The back support attaches to any seat using a strong elastic strap. It can be adjusted up and down for a perfect fit.Maintain the natural curvature of your backCool Mesh Back SupportAdjust up or downEasy installation Color:BlackMesh fabric allows air to circulate behind youSize:40*7.5*38cm/15.8*3*14.6""(L*W*H) Material:Diving Mesh + Steel wire Package includes1x Mesh Back Lumbar Support Vent Cushion HOW TO USE:Simply slip the elastic strap over the back of your chair, position the Mesh Posture Support just above the small of the back, sit back and relax.Ideal for office or home use.Quickly and easily slips over the back of most chairs.Provides lumbar support & promotes good sitting posture.Helps to reduce back and neck discomfort.Ventilated fabric to keep your back cool.The Mesh Posture Support is ideal for office chairs, use in the home and in the car. Designed to improve posture and reduce back and neck discomfort, the Mesh Posture Support simply slips over the back of the chair using an elastic strap.Comfortable to use, the Mesh Posture Support not only helps correct posture, but can also help to keep you cool. The black mesh construction allows air to ventilate to your back for added comfort during a long journey or day at the office.There is 2-3% difference according to manual measurement.please check the measurement chart carefully before you buy the item.1 inch = 2.54 cmPlease note that slight color difference should be acceptable due to the light and screen.