This system smooths curly, dry, unruly hair permanently with a revolutionary straightening system that uses heat to restructure the hair’s protein bond. The result? Smooth, sleek, shiny, straight and regenerated hair. The protein-based professional Yuko® system uses a specially designed, patented heat iron set at over 300° to seal in moisture. Once the cysteine bonds, hair can be molded into any shape. Heat consolidates the straightening process repairing and regenerating hair. The shine and softness are unmistakable.