Hair Guard - Keratin Spray A moisturizing, easy-to-comb hair spray containing keratin and hyaluronic acid that provides protection against external factors such as UV and heat. Purpose of Use: It strengthens the outermost layer of the hair strand and increases its resistance to heat treatment and sunlight. It protects the hair strands against breakage. It adds shine and with its anti-static feature, it allows electrified hair to be easily shaped and combed. How to use: Apply as needed to dry or damp hair. It is not rinsed.