The Sealy 2" CoolGel Memory Foam Mattress Topper is wonderful! We have noticed, that we sleep better, and more comfortably. It not only has helped our back and joint ache's, but also have noticed that we are not to hot or to chilly. *You need to take in consideration you are adding 2" to your mattress thickness. Our king size mattress is 14"+ 2"(the mattress topper thickness)=16", so your bottom fitted sheet will need to fit a 16" or 18" bottom size. This way your bottom sheet will not pop off of the corners. Also your coverlet, blankets and comforters will be 2" shorter. We love this product, and highly recommend it for a great night's sleep! Way to go Wayfair!