Mesh Cover,mesh.PREMIUM QUALITY MATERIALS - Made with premium-quality firm memory foam and is encased in a removable and washable 3D ventilated mesh cover..Focus on spine ,starting from the waist.Relieves and alleviates both acute and chronic pain from:back aches,muscle aches,arthritis,stenosis,herniated disks and general sore backs.Our memory foam is the perfectly formulated blend of comfort and support..MULTIPURPOSE:The lumbar support cushion features an adjustable elastic strap that fits any chair and keeps it in position.Back zipper for easy removal and cleaning.The back cushion is covered using an ultra breathable 3D mesh cover to allow maximum airflow to keep your back cool and to prevent it from sweating..POSTURE CORRECTION:Due to our universal contoured structure,our back support cushions can be placed anywhere along the back of a chair for neck,upper,middle,thoracic,or lower back and spine pain relief.Relieve pressure and improve your back's alignment with a memory foam back cushion..SUGGESTION:If there is a slight odor from the cushion,simply throw it in a cool,ventilated place and the odor can be eliminated.When washing for the first time,please try to avoid washing with washing machine.Just soak it in water for 15 minutes to dry.