Redken Extreme Strength Builder Plus

IPN: Interlock protein network. Fortifying mask for distressed hair. Protein. Deeply condition and strengthen distressed hair. Extreme Strength Builder with Interlock Protein Network and fortifying complex delivers protein and ceramide to help fortify weakened areas, protect internal strength and reinforce surface protection and shine. Hair is healthy-looking and resilient. Safe for color-treated hair. redken.com. Made in USA.