Ergonomic LShaped Design for precise support The Reenly backrest and seat cushion uses an L shaped design that fits the waist curve, effectively wraps the lower back, relieves coccyx pressure, and helps improve sitting posture. Breathable hollow design for all day comfort The hollow design reduces coccyx pressure while promoting air circulation, helping you stay cool and comfortable even during long seated periods. Ideal for office work, driving, or relaxing at home. Nonslip base and machine washable fabric Equipped with non slip rubber dots to ensure stable support on your chair, the cushion also features a removable, washable soft sweater fabric cover for easy care and lasting freshness. Versatile and compatible with most environments Designed to fit most chairs, it provides adaptive support to help you maintain a healthy sitting posture whether you are at a desk, in a car, or on a sofa. Use scenarios Office or home office desk work during long sitting sessions, providing lumbar support and postural guidance. Car driving or commuting, helping maintain proper lumbar alignment and reducing fatigue on long trips. Relaxing at home on the sofa, using the cushion for comfortable seating while reading, watching TV, or resting.