Redken Extreme CAT Protein Reconstructing Treatment uses patented taurine technology & cationic proteins help reconstruct & fortify your damaged hair leaving you with soft, silky hair. The Extreme CAT Protein Treatment is specially formulated to provide a triple line of defence; proteins penetrate deep into the core of your hair helping build internal strength; ceramide enters the cuticle layers to reinforce the structure & help repair any damaged areas; & natural lipids, like those found naturally in your hair help to resurface your hair leaving the cuticles shiny, smooth & protected.