Prolong your favourite hairstyle with the Schwarzkopf Professional Osis+ Undercoat Primer Foundation. Formulated to provide your hair with the perfect base for any style, this innovative resurfacing solution transforms the texture of your hair to reveal a soft surface that's pliable to any style. Perfect for those with a porous hair type, its anti-frizz effect smoothes & nourishes unruly locks for an instant, sleek finish with high shine results. Apply to the midlengths to the ends of damp hair. Do not rinse.