Bought single bed mattress.It was easy to unpack and inflated wellNot to heavy to fit onto top bunk by myselfI havent slept on it just laid on it to test it out for firmness seemed very comfortable my adult daughter did the same and agreed with me.I then moved it to the lower bunk as on the rare occasion adults stay it that room they normally sleep on the bottom. The bunks are usually used by the grandkids aged 13 and younger.At this stage I would buy more for the other bunk and the trundle. Hoping i can update this post after an adult has spent the night on it.