I was slightly wary about getting these, as pillow protectors I've bought in the past make your head sweat as they have a high percentage of polyester.  However, I needed some and these were a good price - have fallen in love with them.  They are soft, yet add substance to the pillow (I have duck feather pillows as cannot stand man-made ones).  These enhanced them! Well made, do the job excellently - and non-allergenic too!