You get 2 inches of quilted fiber fill and 2 inches of memory foam to stack, and it has a 10-year limited warranty. And yes, the fiber fill layer — which is machine-washable — has a gusset to tuck under the mattress, too! But it's still more like a topper than a typical mattress pad, because it's so thick.
Promising review: "It could be the age of my mattress or further maladies of my 9–5 sitting job, but my bed had become increasingly less comfortable. I'm a side sleeper, so when I started getting hip discomfort, I knew I was in trouble. But this really did the trick, my bed is very inviting and incredibly soft. It comforts my hips which is, undoubtedly the biggest benefit here. My time to fall asleep has been cut and my sleep quality is through the roof. In short, if you're of the "soft" persuasion when it comes to sleeping surfaces — this is a magic bullet. My sheets now encompass the topper and the gel cushion, not the mattress itself, but that's not a complaint, just something to note." —Christopher
Get it from Amazon for $79.99+ (available in sizes twin-California king, and as either with "enhanced support" or "ultra soft support").
And speaking of pillow-y comfort: here are some of the best pillows on Amazon!