I bought this to replace my 5" zinus mattress topper that started leaking fiberglass. This mattress is comfortable and keeps my cool at night but it is thinner than I would prefer. It took 72 hours to air out and puff up and still did not reach a full 3 inches on each side. All-in-all, this is a decent low-cost mattress topper that does not use fiberglass. I would not recommend if you are heavier as it would more than likely be useless since it is already so thin.