After buying a memory foam mattress topper a few years ago form Overstock we needed one for our king size bed when we moved. We got the 4 in and was very pleased with it. We were able to sleep on it the very same night. We also ordered one for our friends and they couldn't believe the difference it made with their back problems. My friend said it was wonderful getting up in the mornings with little or no back pain. Great buy, Great product, Great service. I have never been dissapointed with anything I have purchased from Overstock!!!!!!!!!!