This is a one sided mattress. It is extremely comfortable. It isn't too soft and it isn't too firm. I think this is the Goldilocks of mattresses for me. The stitching quality is great on this mattress. I used deep pocket sheets on this mattress and they fit great! I love the size of thickness of this mattress. I think this mattress supported me perfectly. I woke up not stiff and sore for the first time in a very long time. I highly recommend this mattress.