Pacific Coast AllerRest Pillow Protector King 20x36 inch Cotton 300 thread count 100% cotton AllerRest Fabric blocks dust mites. Barrier WeaveTM special woven technology is used to prevent down from sneaking out. King size pillow protector for 20in x 36in king size pillows. Care Instructions: Machine Wash and Dry for easy care Made in the USA of imported materials.