Eco Living Friendly Evolon Allergy Pillow Protector | King Zippered Encasement | Dust Mite, Bed Bug, and Allergen Proof Cover The award winning German engineered Evolon offers 1 micron filtration using a microfilament technology, creating a physical barrier against allergens. Evolon is made using an eco-friendly process and because of its large internal surface area, it can absorb 400% of its weight in water and dries very quickly. This breathable fabric is not coated, and it has no PVCs and no chemical post treatments. The fabric is rustle-free, comfortable, and has no "plastic" feeling. Sleep Safe ZipCover Evolution pillow protectors provide total bedbug, dustmite, dander, and allergen protection making it ideal for allergy sufferers. This bleach safe zip cover is durable for repeated washings. It's the fabric that protects, not chemicals. Wash and dry before first use for cotton like comfort.