This has been great so far, although time will tell whether or not it keeps me cool in the summertime. But this is a huge improvement to my previous traditional pillowtop mattress--so far I have stayed cool and comfortable. I have not felt my shoulders or hips sinking when I sleep on my side, but they are also cushioned so that they don't get uncomfortable. I'm really glad I was able to snag this mattress for the winter sale. :)