Sit-Straight Coccyx Relief CushionsDished area in the back of the cushion provides pressure relief at the base of the spine Uniform top layer of soft pink T Foam (Temper Foam) provides anatomical conformation, while the resilient, high density foam offers cushioning and support The convex solid seat insert base provides a superior sitting platform Covered in breathable, waterproof, black AliTex No slip bottom 3" H front, 2" H back 1 each LATEX FREE No MATERIAL Nylon Foam,Vinyl foam