I am loving my pillow protector. By firmly enclosing my pillow in a zippered case, fewer allergens can settle into its depths. Additionally, the fabric serves as a grippy layer between my pillow and the satin pillowcases I prefer to use. Prior to adding the pillow protector my pillows would start to ease their way out of the slippery cases during the night. With the  protector that hasn't been an issue at all as it serves as a grippy layer between the 2 more slippery fabrics.