Milliard 4.5 Inch Memory Foam Replacement Mattress with Breathable. Waterproof and Washable Cover for Full Size Sleeper Sofa and Couch Beds – Full

I bought this queen sofa bed mattress to replace the old spring mattress on a 30 year old sofa bed we have in our Airbnb. We shopped for a new sofa bed but quickly realized it just wasn't in the budget. After seeing there is really no difference in the design of the bed frame in an old vs new sofa bed we opted to just by a new mattress. As you can see from the picture this mattress is the same width as the old blue spring mattress but is a few inches longer and just a tad thicker. There is a space on the sides between the frame and the mattress but there was a space with the old mattress as well. Not only does it fold up in the couch but it folds up with ease even after I added the encasement cover pictured, the mattress pad, and the fitted sheet onto the mattress. I haven't slept on it but the few minutes I tried it out it's definitely more comfortable than the old mattress. I could not feel the bars like I did with the old one. I'm excited to offer this comfortable upgrade to the sofa bed for our guests.