I wanted to love this topper, especially based on the all the nice reviews.  It had NO SMELL at all when I first unwrapped it, and expanded nicely over a few hours.  I give credit for no smell, that was a very good thing.  HOWEVER.  The foam is super-hot, it's like sleeping on a heating pad, and it's super-soft with little support.  I'm small (5'2" and 118lbs) and it had me sinking into it, waking up hot.  The material of the foam cover is cool to the touch, but it's ultra-slippery. My cotton jersey fitted sheet slid all over it, and when I covered this cover with a cotton mattress pad (with mesh to fit under the mattress), it had the mattress pad sliding all about, creating dimensional wrinkles.  So, too soft, too hot and it just doesn't work.