I have bought a dozen toppers over the years with college kids moves etc. I saw this in club and thought Serta perfect. The worse ever. It doesn't even get close to the normal size. Large areas when it never expanded. Now I have to lug this back to store to return. This really is the worst product ever purchased. So disappointed.

Hubby and I have a split king adjustable bed with latex foam mattresses. The mattresses are too firm so we purchased two Twin XL toppers. Opened up them up, put them in the pillow top cover and they molded to the beds right away. Oh my, they are so comfortable! They made our mattresses feel wonderful. However, after a couple nights of sleep the pads start shifting in the pillow top covers and off the mattress. The separation of two Twin XL mattresses now feels like a 6" valley in the middle as the pads both shift outward. We wanted to keep the individuality of the adjustable beds, but maybe we should have purchased a king sized topper. We've tried everything we can think of to keep the toppers in place; nothing is working. So if you have a split king like we do, I wouldn't recommend them for this type of bed.

I have only slept on this one night and know I can't keep it. 1) The foam itself is only at best 3 inches thick (on a 4" marketed topper - do better, Serta!) 2) It retains body heat and can make sleeping temperature extremely hot (unless that's what you want) 3) Mine also had that yellow chemical stripe on it - it's not urine as others have stated, I think it's from chemicals/being stored in non-temp controlled warehouses

I purchased this King Serra mattress topper over a week ago. After the 1st topper never expanded to form, I returned to Sam’s Club. Thinking I happened to get a faulty product I exchanged for a another and tried again. Same Issue! Second topper never expands. They’re all bad! Don’t waste your time or money

Comfortable cooling and perfect fit.

Too soft. More like a soft piece of foam on the bed.

We are very satisfied with this purchase. Very comfortable

So comfy and more cost effective than buying a new mattress!

Comfy and stays in place on top of my other mattress.

Easy to put on and very comfy.