This is an environmentally safe product that will help to extend the life of your hat or any other item in your wardrobe. Use on hats (straw, felt, and fabric). It helps to prevent damage from perspiration or grease! The light spray dries quickly and will not change the color, tone or texture. It does not seal the pore structure, so all leather, suede and fabric can breathe. Non-silicone based product repels water and dirt while preventing staining and discoloration. Coats the fibers of the felt hat or material allowing it to be water and stain repellent without affecting breathability. Will not affect any future cleanings or reblocking done to the hat by professionals.