The cotton eye pillow cover is designed to fit Soothie eye pillows.  This is a cotton cover that can be removed from the eye pillow and washed. The cotton cover is designed for freezing. To freeze your Soothie eye pillow, place the pillow inside a cotton cover, then place on a rack in your freezer. It will become icy cold in a few hours but will stay soft. Always let a frozen Soothie warm up to room temperature before heating it. 
 
You may also heat your Soothie eye pillow. To heat it, place your Soothie eye pillow inside a flannel cover then heat in the microwave for 1 minute. Always put your eye pillow in the flannel cover before heating it or it will be too hot to get into the cover after heating it.