Full XL comfort without the plastic feel. This waterproof mattress protector measures 54″ × 80″ and uses an upgraded 3D air fabric surface with 40% rayon made from bamboo fibre and 60% polyester, so the bed feels softer and more breathable than a cotton terry cover — a welcome difference for hot sleepers in summer. Beneath the fabric, a waterproof backing keeps spills, sweat and everyday accidents on the surface rather than in the mattress. The smooth non-slip backing is paired with a stretchy skirt that reaches up to 18 inches, so the cover fits daybeds, sofa beds, hospital beds, dorm beds, waterbeds and extra-long memory foam mattresses, and it stays put without any plastic noise. Care is straightforward: machine wash in cold water on a gentle cycle, tumble dry low, use an all-natural detergent and skip bleach. The cover keeps its shape even after repeated washing.