This Wella SP Smoothen Infusion is an intensive smoothening personalized treatment. Combined with any Wella SP masks, the Smoothing Infusion adds extra smoothness & controls frizzy hair with long lasting anti-drizz protection. How to Use: Add one single-dose of Smoothen Infusion (5ml) to 25ml of SP Mask. Mix together evenly. Apply on toweled dried hair. Leave on for 5-10 minutes. The effect will be intensified with heat. Rinse out thoroughly.