Microfiber LONG-LASTING: Pillow covers standard size are made with a high thread count and a tight weave of the finest quality microfiber fabrics to prolong the life of your pillows. Pillow protectors save pillows from dirt as well as wear and tear. VALUE BUNDLE: This set includes 4 pillowcase covers. These standard pillow protectors are all machine-washable, so you don’t have to worry about a thing! ZIPPERED PROTECTION: Each pillow case protector has an auto-lock zipper on the side of the pillow, ensuring that dust doesn’t creep in. Plus, having a zipper on the back of the pillow cover keeps it away and out of sight. BREATHABLE FABRIC: Our pillow protectors with zipper standard size are made of extremely soft cooling microfiber. Each pillow case with zipper will keep you cool in the summer and warm in the winter. GUARANTEE: Our zipper pillow cases are backed by a promise that you’ll love them. If you see any problem, you can contact our customer service team to get it fixed. Enjoy sleeping on a pillow protector today! Prolongs Pillow Life Safe from wear and tear: 4 Pack pillow protectors king 20 x 36 inches size zippered set of 4 are made with high thread count , tight weave finest quality microfiber fabrics, to prolong the life of your expensive pillows. When you remove 4 pack pillow protectors king size with zipper for washing the pillows are almost new out of the covers.Pillow Protectors save the pillows from dirt as well as from wear and tear.