I was really excited to get a memory foam topper, but once I put it on our bed it smelled of terrible chemicals for about 2 weeks. I even followed the instructions and allowed it to air out overnight. I thought it would go away sooner but wow, 2 weeks...not happy. But that's not where this ends...it also makes the bed so incredibly hot you want to die. I am not a person that sweats much and I woke up every night dripping with sweat because of how much heat this thing holds in! It was so gross. It also was way too soft to be considered medium to firm. The topper made us roll to the middle of the bed, super annoying. My old mattress we bought this for wasn't even 2 years old and I have a platform bed, so it wasn't the bed frame or mattress causing the rolling to the middle. My husband insisted that we just keep it on our bed because he thought it would be ok eventually. I hate this topper with a passion and luckily after having it for about 6 months we agreed to just buy a new mattress and that the topper wasn't doing any good. He was still having back problems and I was still sweating every night, no matter the level of air conditioning we had going. I had entirely too high of hopes for a topper. I would not ever buy any kind of memory foam topper again after having this.