- OSTWINT KERATIN HAIR CARE MASK It gives flexibility to your hair so that your hair achieves a silky soft and shining appearance, while also helping your hair strands to re-establish the moisture balance. - It reaches the inner structure of the hair and starts repairing it, making the hair stronger and more durable. It repairs the worn out structure by having a restructuring effect. Suitable for fine hair types. Thanks to the protein it contains, it strengthens and nourishes the hair and prevents it from frizzing and breaking. It prevents and repairs heat-treated hair from damage. It allows hair to grow easier. Application: Apply to wet hair without touching the roots, wait for a while and rinse your hair.