I had to return this mattress topper because the chemical odor was really bad and only got worse over time. I purchased the mattress topper because I usually woke up with lower back pain. Turns out this mattress topper did not help much with the back pain. If you decide to buy this product, I hope it works for you because it had very good reviews when I bought it. However, I have to mention that I probably lost 4 pounds fitting the mattress topper in the original shipping box. Plus overstock charged me $$$ to return the topper. This will be the first and only item I buy from overstock. I recently bought a convoluted mattress pad from walmart, and I don't wake up with back pains anymore. Cost $$$.