This is a futon style mattress, not much for support, but it is soft enough for my daughter (who really doesn't like firm mattresses). It's small enough to work for bunk beds. Probably not supportive enough for an adult to sleep, but for us it's perfect. The cover zips off. Great price. No offgassing noticed (it wasn't wrapped in plastic, which likely helped).
If you have tight stretchy fitted sheets, it pulls up the corners of the mattress. Doesn't affect the functionality.