Aeris Donut Pillow - Best Memory Foam Seat Cushion with Machine Washable Blue Plush Velour Cover This cushion relieves hemorrhoid discomfort and pain, while also promoting a healthy posture and proper spine alignment. Exceptional comfort for cars, plane seats, offices, kitchens, computers, sofas, and any other types of chairs. Special design with a central function hole that reduces pressure on the coccyx while sitting. Made of the highest quality foam material available. 80% cotton, 20% polyester machine washable blue plush velour cover.