Whisper Organics Waterproof Mattress Covers are 100% waterproof, providing a barrier that prevents moisture from entering the mattress. They're also GOTS-Certified organic, so it's good for you and the environment. The organic fabric for the front and back promotes a healthy sleep while protecting your mattress. Our Mattress Protector keeps your bed clean and extends its lifespan by blocking sweat, spills, stains, and incontinence.