AWEN Curve Slow Rebound Memory Foam 3d Ventilative Mesh Lumbar Support Cushion/ Back Cushion / Support Cushion Helps the Lumbar and Sacral Region of the Spinal Column & Helps Promote Good Posture While Sitting- Excellent for Home, Office, Car and Wheelchairs- Size: 13.4''*13.4''*4.7'' (Black) Comfortable seat for individuals sitting in chairs, riding in cars, scooters, etc. Excellent for improving your posture, reduce stress to the back and alleviates lower back pain. Extents from the base of the spine up to the lower-midpoint of the back. Use on the base of the seat to boost height to correct position for typing at your desk or better visibility in the car; 3D mesh cover with zipper & elasticized belt. Inner Material: Breathable inner material! Anti-bacteria Allergy Anti Dust Mite. Protect inner core from pollution.