These king-size pillowcases are claimed to be made from the finest cotton with 400 thread-count for highly breathable comfort. They are made of percale fabric which is crisp  (cardboard-like) and feels cool against the skin. Each wash is supposed to make the percale pillowcases softer, however, washing these was a nightmare and forever altered the texture of the pillowcases. They shriveled up and wrinkled much like a raisin. Not to mention they were stiff as a board. I really liked these pillowcases prior to washing them but they are nothing like their description states. The worst thing is, they feel eco-friendly. Who wants to rest their face on cardboard for 8 hours a night? Not me. I would not recommend these pillowcases. I’d run to return them if possible!