Redken has a trademarked Keralink protein that binds moisture to hair and also uses Amino Acids and Proteins here. It's all called IPN- Interlock Protein Network.
I think this line is pretty fabulous, as most things Redken are, but overall it was more moisture than my hair needs. My hair has gotten drier, but it's not dry and not too frizzy. The shampoo/conditioner combo does pack a lot of moisture , and my hair was ultra smooth. For those who need it, you should try it.
Other products in the Smooth Lock line are Butter Silk rinse out deep treatment and Heat Glide protective smoother.
Shampoo $ 14.50
Conditioner $ 15.50
Stay Sleek$ 15.50
Butter Silk $ 15.50
Heat Glide $ 16.50