Let me start by saying the entire point of this purchase was to obtain a firm mattress! I previously had a cool gel that was quality, and did me well. This product has yet to expand all the way and currently the left side is was more firm than the right. I'm a petite woman and I SINK into the thing every time. Granted I received it yesterday and was so excited for a restful night's sleep. Thankfully amazon is refunding me for this purchase without returning it. I should have listened to the critical reviews. Thankful I got my money back but no idea what to do with this crap!!