Ergonomic Designs: The contour of the chair cushions imitate the buttocks, cradles your buttocks and joints well, protects the tailbone and provides sufficient support for the spine. The hollow design allows air circulation avoiding heat build-up. y Highly Elastic Memory Foam Pillow - Made with high quality memory foam. This pillow is made of high density memory foam which slowly returns to its original shape. Memory foam pillows are expertly designed to ensure maximum comfort in all correct sitting positions. yMesh design and removable pillowcase: Removable and machine washable, easy to clean, non-slip rubber design on the bottom. Mesh design provides better air circulation Safer: When driving, the anti-decubitus pad can reduce discomfort caused by driving and improve your concentration when driving. A secure posture will be more conducive to driving safety. At the same time, it can cause children to develop correct sitting habits unconsciously. Widely used: You can apply this coccyx cushion in office chair, gaming chair, wheelchair, highly recommended for students, pregnant women, old people, office workers, etc.