Registry 230 Thread Count Cotton Pillow Protector will keep your property s pillows clean and fresh, while enhancing guests comfort They feature a rustproof nylon zipper and is made of 100 cotton for comfort and breathability The pillow protector slips easily over the pillow and zips closed, providing a secure and clean middle layer between the pillow and pillowcase This king size pillow protector measures 21 W x 37 L