The Christopher Knight Home Greenzone Jersey Pillow Protectors starve off dust mites by sealing off and protecting the pillow from secretions. The rayon from Rayon Made from Bamboo pillow protector provides chemical free, waterproof protection keeping your pillows, dry, mite free and safe. The pillow protector fabrics are tested by the internationally accredited laboratory Oekotex and are free of metals, phthalates and other harmful chemicals, giving you peace of mind and providing you with a night of safe and comfortable sleep. Simply put, this product is essential for anyone seeking a clean and pure sleep environment. The Christopher Knight Home Greenzone Pillow Protector has you and your loved ones's pillows protected.