I purchased this over a year ago and am just now getting around to submitting this review. After purchasing an inexpensive (cheap) mattress for my daughter's room I had serious buyer's remorse. It was beyond uncomfortable after sleeping on it for more than 15 minutes. I was going to break down and purchase another mattress and then came across this mattress pad. Had had serious doubts as to the the likelihood it could fix the problem, but it was much less than buying a new matress. So, after reading so many great reviews I decided to give it a try. Soooooo glad I did. I don't know how it works, but it turned a miserable sleeping mattress into a consistently wonderful night of sleep every night. I am going to order one for the RV I just purchased!