A mattress protector is a cover or lining that goes on top of a mattress to keep it clean, protect it from spills or stains, and prevent dust mites or bugs from getting in. Full definition
Some items are a potty, potty training pants, waterproof mattress protector, toilet training seat, step stool, reward chart with stickers, and baby wipes. (momenvyblog.com)
And then I purchased a vinyl mattress protector for $ 9 to cover it. (aehomestylelife.com)
I find that the corners on the fleece crib mattress protector sometimes flip up, and I think a binding would help it lay in place better. (thinking-about-cloth-diapers.com)