Classic Brands 4.5-Inch Cool Gel Memory Foam Replacement Mattress for Sleeper Sofa Bed, Twin MATTRESS ONLY. Fits most standard fold-out sofa bed sizes. Cool gel memory foam sleep sofa replacement mattress easily folds into most sleep sofa beds and returns to its original form after many uses The gel-infused memory foam draws heat away from your body, so your guests can remain comfortable while they sleep High-quality memory foam and pressure relieving gel memory foam are naturally hypoallergenic and resistant to allergens, mold, bacteria, and dust mites and it meets CertiPUR-US program standards for performance, emissions, and durability Medium plush-feel Mattress ships compressed, rolled and shipped in a box conveniently delivered to your door for easy set-up; sofa not included 3 Year Warranty