LOVE, LOVE, LOVE this mattress!!! Super soft and like laying on a marshmallow!! If you are looking for a firm mattress this is NOT it. I wanted something super soft after trying to sleep on an innerspring mattress and this fit the bill perfectly. The top cover is soft to the feel and there are tiny breathable holes all across the top layer. I would certainly recommend a box spring under it as it will sag if used alone on rails etc. My daughter laid on it and said I have to buy her one now too!!! Highly recommended for those persons looking to have a soft 'enveloping' mattress.