I ordered this to go on a trundle. Great mattress for the price, I ignored the 48 hour airing because it popped to full size in an hour. I have been sharing it with my toddler and we sleep very comfortably. It is a little longer than the trundle itself so it hangs off a bit but its not a huge deal. Overall great buy, would buy again. Only complaint is the chemical smell isnt going away and its rather yucky for that.