This is a quality pillow protector that fits my standard-sized memory foam pillow well.  My previous pillow turned a bit off-white/ yellow over a few years, so wanted to use a protector to keep the new pillow clean and this one should do well.  It's very light-weight and breathable so I have not noticed any temperature changes or changes to comfort, which is the best compliment for a product like this.  Definitely worth it.