One of the main draws of AllerEase's Ultimate Pillow Protector was that it is made of cotton and helps to balance the users temperature. I thought that it did just that! It has been pretty hot here, and I didn't find myself waking up because I was too hot. I think this is probably because of the breathe-ability of the cotton. It's nice to know that allergens will not be collecting on my pillow, and that I can throw this pillow protector into the washer and dryer whenever they need to be cleaned. These are a plain white fabric that didn't show through my pillow case.