We replaced the original 60x80 inch queen mattress in our 2012 13QBB with the 5.5 Elation mattress from Mattressinsider. They are a Denver Colorado based company / USA manufacturer. https://www.mattressinsider.com/memory-foam-rv-mattresses-2.html We are thrilled with the mattress, it rivals the comfort of the $2,000 box spring and mattress at home! I have used hunting clothing with CoolMax fabric for years and it works as great on bedding as well. The ability to flip the mattresses and have the choose of firmness is a great added value. Mattressinsiders customer service is second to none. The second trip with our new mattress I noticed when we stripped the bedding off at the end of the trip that there was edge seam that was open for about three inches. I called Mattressinsiders and they had a warranty replacement to us in five days at no expense to us what so ever. On top of that they said if we knew of a charity or needy family that could use the mattress to donate it to them. My wife stitched the seam and we found the mattress a new home. Great products, great service, you can not beat that.