Mainstays 3" Memory Foam Mattress Topper, Twin

This topper went on a budget mattress that wasn't as comfortable as we'd hoped it was going to be. And it made a very satisfactory difference. Super soft, so much so that at first we were afraid we'd made a new mistake, but after a few nights we give it 5+ stars. There is give on pressure points (particularly our shoulders) but enough general support that neither of us developed any back issues. We placed it directly on the mattress under the mattress cover. There was no slip even though it allows the sleepers to move around freely. Wonderfully, it's slightly bigger than our queen mattress so after placing the sheet the topper folds over the mattress almost like a hem, leaving no gaps or bothersome edges. Two inches seems cuddly enough without raising our total mattress height too much. You probably need to consider deep pocket sheets. It arrives looking like a big cinnamon roll, unpacks easily and was immediately ready for use. I have read that there is off-gassing with memory foam - it was not noticeable in this topper unless you buried your nose in it and after an hour it was all gone.