I ordered the Twin XL size of this cover for my dorm room, and I was INORDINATELY pleased with how comfortable it made my plasticky military-issue bed. The best part about this mattress cover is how tight you can make it on your mattress, probably because of the banded/accordion-style sides (you can see them in the picture). That means the cover fits all sizes of mattresses, whether you have a pillowtop or nothing (like me), and you can adjust it so it stays perfectly in place. Other covers have always slipped or shifted, even a little bit, but this one stayed on like it was built into the mattress. It's also nice and thick, and just the right level of softness and firmness. I plan to buy one for my full-size bed at home.