Our Ripple Comfort Seat is an all in one solution for those looking to make uncomfortable chairs more bearable.This over the chair cushion has a pressure reducing seat base with a supportive back which includes a built-in lumbar support.The Ripple Comfort Seat has a built in elastic strap around the back to fasten it to your chosen chair.Made from ripple / egg box foam.Back measures: 16.5” x 16.5” x 2”Seat measures: 16” x 16.5” x 3”