CHI 44 Iron Guard Thermal Protection Spray Gives you superior heat protection for your hair. With the power of ceramic in it, CHI 44 Iron Guard provides superior heat protection from the inside out against styling and finishing damages from the hottest heat styling tools. Hair will remain silky and shiny. Your styles will also last longer with use. Directions: Section your hair and spray evenly over dry hair. Start using your heat styling tool from roots to ends.