So Liss Sarah K is a product developed for the treatment and progressive straightening of hair. It contains in its formula Whey Protein and Keratin, rich in amino acids they strengthen the hair fiber . The result is a hair much brighter and silky. In its composition contains an advanced technology, developed with acidic nanoparticles highly cationic peptides, able to make the product penetrate in the hair cuticle, creating a structural protein sealing around the cortex, and providing a continuous and progressive smoothing treatment In Blond, Red color naturally light Hairs: avoid temperature above 190° C. Waiting from 24h to 48h to wash hair, helps to improve the results.