I bought this mattress for a daybed and trundle because I wanted something that was not so heavy so that I could change the sheets easier. Daybeds are notoriously hard to make. Overstock said lightweight, but did not say how much it weighed. I called as well and no one could tell me how much. Bewarned, it is NOT lightweight. Probably medium weight. Lighter than a regular mattress though. Would be much more manageable if the sides had handles you could pull to adjust the mattress on the bed.The mattress is VERY firm. However, my 3 year old did not seem to mind. Because I wanted a little more luxurious bed, I decided to buy a memory foam topper to put on top. NOW the bed sleeps like heaven. Firm, but heavenly soft.