1. Unique ergonomic design: This lumbar cushion with additional attachment options is designed to support and correct posture along the natural arch of the lower back. It provides comfort support for different body parts, relieves fatigue, and helps bid farewell to back pain, welcoming pure relaxation. 2. Premium memory foam: Our lumbar cushion for car seats is made of high density memory foam. It is soft yet sufficient support and doesn't flatten over time, providing long lasting comfort with the right balance between support and comfort. 3. Relieve back pain: The lumbar cushion for office chairs has an insert buckle design and a wider fixed belt to fit different waist circumferences. After adjusting up and down to the waist pain point, it precisely fills the waist gap, conforms to the waist curve, and targets the pain point. 4. Breathable, removable, washable cushion cover: The back cushion comes with a 4D mesh zip pillowcase. It is comfortable, breathable, machine washable, and easy to clean. The breathable, skin friendly polyester cover allows air to flow through the cushion, keeping your back cool, dry, and comfortable. Note: do not wash memory foam.