6-Piece: 400 Thread Count Cotton Pillow Cases. You and your pillow are practically married. You lie down together every night, and you rely on its support to function happily and with utmost health every day. That's why you want to keep it in tip-top shape, and what better way to do that than with this 100% Cotton 400 Thread Count Feather & Down Proof Pillow Protector? Two protectors come in this deal--six protectors that feel like finely woven sateen and will keep your pillow clean and fresh so you can sleep easy every night. So buy this and Save 79% 6-Piece: 400 Thread Count Cotton Pillow Cases.