We highly recommend that you protect all your quality pillows with an organic Zippered Pillow Cover. The pillow is placed in the zippered cover and then into your pillowcase. Standard, Queen and King sizes are available. These are made to fit all Holy Lamb Organics pillows but can be used for all similar sized pillows. Made with organic 250 thread count cotton sateen fabric. Made in the USA by Holy Lamb Organics.