Permafresh represents a break though in technology: it is a long lasting protector that will give 100-Percent protection against hundreds of common bacteria, bed bugs, dust mites, and insects. Permafresh uses 100-Percent polypropylene, a non-woven material, which is bio degradable therefore eco-friendly. This pillow is 20-Inch by 26-Inch and Filled with 100-Percent Polyester. The 100-Percent polypropylene cover is non-woven and provides water resistant protection.