I ordered several o these pillow protectors bc I have been having problems with allergies and thought this could help.  I am using them but would like to point out that they seem to be made of a combination of cloth and plastic.  The only thing I don't like about them is that the air in the pillow is not released right away when I lay on the pillow and seems more like I am laying on an inflated pillow.  It eventually releases the air trapped in the case - but I would like it better if the pillow felt the same to me.  I guess the plastic feel is part of what keeps out allergens.