My husband and I have both had back surgeries and need a firm mattress. I had ordered a foam mattress for our lake cabin and it was OK for me but much too soft for my husband. This mattress is perfect. When we placed it on the queen bed, still in the vacuum wrap we were sure it was the wrong size- it looked like a double mattress. As soon as we opened the plastic wrap it immediately poofed to the correct size. Like in 2 seconds! I wish I had videoed it because was amazing! For the price this is a great mattress and I am about to order one for our old travel trailer. It was  delivered when expected, as have all purchases from Wayfair.