AristaComfort Coccyx Cushion- Butterfly Shape, Steel Gray Cushion Cover Made of Rich Velvet Imported Design patented SOFT coccyx seat cushion. Unique design with a cut-out relieves pressure on coccyx (tail bone) and reduces stress on your spine. Two usable sides. Flip the cushion 180 intermittently to allow decompression of side not in use. Dual- layer construction for comfortable seating experience. Top layer of soft latex. Base made of engineered foam. Will not squish down even withr weights upto 250 pounds.