LINENSPA Waterproof Protective Mattress Pad - Hypoallergenic Microfiber Cover - King microfiber Waterproof protection that is soft and quiet on your mattress Cozy microfiber cover with a vinyl-free liquid-proof backing that is safe for pets and children Hypoallergenic down alternative filling is quilted for a smooth, breathable surface Corner elastics secure pad to mattresses up to 18 inches thick King waterproof mattress pad: 78" x 80"