The 4" All Cotton #604 21x28 Chair Ottoman Natural futon mattress has a firm surface feel. The All Cotton construction has more densely packed cotton inside for durability and firmness, with Gold Bond's custom-blended "JOY" cotton batting providing resilience and longevity.This starter futon mattress is available in various sizes and colors, and is made from 55% Cotton/45% polyester materials. With a thickness of 4 inches and dimensions of 21 x 28 inches, this chair ottoman futon mattress provides a firm surface feel. The TechnicalSpecs include 4' All cotton with 40 lbs of Gold Bond Joy cotton batting.Designed with a focus on durability, this futon mattress is perfect for those looking for a starter option. With no assembly required and no need for additional batting, the 4" All Cotton #604 21x28 Chair Ottoman Natural futon mattress is a convenient choice.