I have a basic Select Comfort mattress that we have had for over 15 years. Love my bed, but it is hard without some type of topper. This one is lovely! Extreme comfort and the 1 1/2 in. pillow top stops the heat that you can have with memory foam. Highly recommended. But you do have to be careful getting in and out of bed. My bed is high already and I have to climb into it with this new topper. The edges are soft and I almost fell off the side the first day getting up in the morning. I get out of bed too fast anyway, so now I just have to make sure I have both feet off the bed before getting up. Many memory foam toppers say they are smaller than the mattress, but my Cali King was the exact size so it covers the whole bed. I like a soft snuggly bed, this goes perfect with my new soft latex pillows I also bought on Overstock. I have been looking for quite a while and I am very pleased with my purchase.