And a machine washable zipper velvet cover for easy cleaning. U-shaped design cushion for office chair provides the best comfort while reducing pressure on the coccyx, and tailbone and promoting well-shaped posture. Our coccyx seat cushion pillow is suitable for various seats on most occasions, office chairs, car seats, desk chairs at home, airplane seats, or wheelchairs. Humanized designs for this ergonomic seat cushion, which covers 2 layers of linings to protect the memory foam to be intact and clean. And also with an anti-slip base to fix on the seat well. Please email us to order and custom logo.