Was skeptical about ordering this, as I'm skeptical of all mattress toppers. Our daughters mattress is not the newest, and definitely not fancy. She has never complained, but I feel guilty in the back of my mind ha! So oredered this and it's SO much better than I thought! It covers much more than just the corners on the bottom, and so far has stayed put. Even with our four year old jumping on the bed. Very soft too. Great price, you won't be disappointed.