Udo Walz Strong Chia, 100 ml, Hair Serums for Women, The Udo Walz Strong Chia leave-in treatment gives your hair everything it needs after washing. Characteristics: penetrates the cortex of a hair and strengthens it gives your hair intense shine restores dry, brittle, and damaged hair smooths the surface of your hair Ingredients: no sulphates no silicones vegan product How to use: Apply to wet or dry hair. Do not rinse.