Dreamer Car Supportive Memory Foam Full Back Cushion Car Back Support for Office Chair, Chair Cushion with 3D Mesh Cover Balanced Softness Designed to Relieve Sciatica PainBlack Promote Sitting Posture: Ergonomic shape designed office chair back support fits your back's curve,support upper back,middle back and embrace waist support. Relieve Back Pain and Muscle Tension: High density foam core which features supportive and comfortable relieve back pain and muscle tension.Note: some people only doctor can relieve their back pain rather than this memory foam chair cushion. Foam Core is Completely Odorless: Most other chair back support cushions are smelly, but Dreamer Car back support cushion are completely odorless,keeping your car room clean. Doctor highly recommend this cushion for chair to the people who suffers Asthma and Rhinitis. Non-slip Rubber Bottom,Adjustable Straps and 3D Mesh Cover:Double-safety keep car back support cushion in place without sliding down.Ventilated washable 3D mesh cover keep your back dry and cool,COTTON INNER COVER extends the durability of the foam core. 1 Year Guarantee:If you are not 100% satisfied,contact Customer Support before amazon service. Just return your back cushion within 1 year since the purchase date, and then we will send you a free replacement or give you a refund.