Softness for dry/brittle hair. IPN: interlock protein network. New. Cleanse, restore and soften dry, brittle hair. All Soft Shampoo with Redken's exclusive Interlock Protein Network and Keratin Enrich Complex with omega-6 enriched argan oil nurtures hair's protein, composed of keratin, and nourishes hair for intense softness. Hair is silky soft with increased manageability, suppleness and lasting shine. Safe for color treated hair. redken.com. Made in USA.