I bought these specifically to throw on a couch when I go to work (I have 2 dogs who sleep on ouch when I'm away). These are 100% polyester--and that's just what they feel like. I'm not sure what "microfiber" has to do with it--they feel like sleazy polyester sheets. They do the trick for keeping dog hair off the couch, they wash and dry easily , and they were not expensive. I can't imagine actually sleeping on the, though.