Fortifying and heat protective 3-in-1 leave-in treatment for damaged hair. Benefits Prevents new damage from daily hot tool use Strengthens the hair fiber to reduce breakage Visibly reduces the appearance of split ends by 70% Protects hair from heat up to 230°C (450°F) Key ingerdients Biotin - key active ingredients, supports hair growth and helps combat hair loss. Biotin also supports the health of your scalp by producing fatty acids which in turn helps the health of your hair. Moreover biotin supports your hair's keratin, making your hair stronger. How to use Prep hair by washing with Redken Extreme Shampoo and Conditioner. Apply a dime-sized amount of product to damp hair, concentrating on fragile or damaged mid-lengths and ends. Leave in. Do not rinse. Heat style hair as usual. Extreme Play Safe will protect hair from heat damage up to 230°C (450°F).