Auto-inflating Donut Cushion Inflates and Deflates in Seconds Add comfort to any seat with this donut shaped cushion that evenly distributes weight, while providing support. Helps to relieve pain and pressure caused by prostatitis, chronic pelvic pain, and hemorrhoids. Inflates and deflates in just seconds automatically, with no pumps or batteries. Great for travel, sporting events, movie theaters, and every day use.