Waterproof - Sleepzen has designed a 100% waterproof pillow protector thanks to a new generation polyurethane membrane on the pillow side. Fleece - For extra softness. Quiet - Its cotton design prevents friction noises. Hypoallergenic treatment - Its Bi-ome® technology effectively protects you against dust mites, bacteria, bedbugs ... Breathable - The waterproof membrane is breathable to ensure freshness and hygiene. Easy installation and impeccable hold - Thanks to the zipper with a large opening.