I love memory foam so I went for the cream of the crop here. What I didn't realze is that 4 inches is quite a bit of foam and maybe hard to move once you have "sunk in" But, I adapted and all is well. Still.... wish I would have gone for the 3 in. or even the 2 in. and only because I am struggling to keep my sheets on. With the addition of the foam topper my mattress is now 25 inches thick. The only hic-cup I found with this product is that it is short on the sides. The measurements read: King: 76 x 77 in. in the ad, but in reality, it is more like 76 x 75. It either fits the bed across and is too short head to toe or the reverse. But for the price, well worth it! You will pay alot more elsewhere.