Donut Seat Cushion Pillow Designed by FOVERA Orthodesign An Ideal Orthopedic Seat Cushion for hemorrhoids/ Reduces pressure on the pelvic, coccyx, lower back, and perineum. Relieves pain from hemorrhoids, pressure ulcers, prostatitis, pregnancy, and lower back pain. Advance Donut Pillow Design Concept Made of dense premium comfort foam. Will not flatten out with prolonged use. Will not deflate like inflatable donut cushions. Non-slip bottom ensures the cushion stays in place and will not shift or slide on any surface. The removable Velvet cover is machine washable for easy cleaning. Stable Sitting Experience Everywhere Great for use on any kind of chair, car seat, plane, and wheelchair. Two Sizing options: M for Below 80kg Wt. and L for Above 80kg Wt.