After we opened the package the chemical odor of this product was overwhelming and we had to let the topper air out in our garage for 3 weeks until the odor subsided enough for us to put it on our mattress. But after the airing out it was fine and now we absolutely love it. My husband hasn't had back pain since we began using it and I haven't had any more bursitis pain. It's very comfortable and we finally have a good night's sleep. The price is excellent. We strongly recommend this product...minus the odor of course!