This superior thermal protection spray works from the inside out. Formulated with positively charged silk molecules and ionic/cationic interlink technology, CHI 44 Iron Guard spray interlocks into hair's natural structure to build resilience and boost moisture. This spray helps to protect your hair from the heat of the iron, while adding shine at the same time. It's great for any hair type, but especially ideal for dry, curly, or thick hair because it will help reduce frizziness and flyaways.