It's always ideal to protect down pillows with a pillow protector to prevent hair and body oils, as well as other elements from penetrating the down in your pillow. Personal and environmental elements can decrease the life span of down. Our 360TC, 100% combed cotton, gusseted protectors are specifically made for our gusseted Nirvana pillow or any other pillow that has a gusset. The down proof Nirvana pillow protector has a concealed zipper and double-stitched reinforced seams. Sold individually.