60% Cotton 40% Polyester HIGH-QUALITY COMFORT: 200 thread count for a soft, smooth and noiseless king size pillow case that fits snugly over pillow, and a non-intrusive hidden zipper that won’t poke or irritate; our white king pillow cases set of 2 fits 20x36 inch pillows TIGHT WEAVE HIGHLY PROTECTIVE: Because of their very tight weave and generous thread count these pillow protectors provide the utmost in pillow protection PROVIDE BARRIER: Using these high quality pillow protectors Breathable quiet and temperature controlled; Noiseless and comfortable cotton won’t irritate skin or interrupt sleep; Safe for children and pets; High quality zipper and double-stitching provides durable and long lasting protection EASY CARE: Machine wash on gentle cycle in cold water, tumble dry on low; use non-chlorine bleach only or fabric friendly stain remover product; Cases will not lose shape or shrink after washing and drying Try These excellent quality Zippered Pillow Protectors