My wife and I have a guest room with a Calif.King bed. It was rock hard and no fun for our guest. We ordered the slumber solutions topper with our fingers crossed. It arrived right on time and we rolled it out. No smells at all and in little time it was fully expanded. That night I wanted to check it out and laid on it for a short time just to see how it felt. I woke up 4hrs later feeling great!! Our guest then came and both of them have trouble sleeping. Their comment to us was "we didn't want to get up it was so good".