The lightweight leave-in treatment serum preps hair with pre-style protection from heat styling and the drying effects of the sun, while providing plant-powered frizz defense for up to 72 hours. The vegan hair-smoothing formula features a plant polymer shield and botanical smoothing oil blend to protect against humidity, keeping your sleek hair smoother for longer. Aveda smooth infusionâ„¢ hair style-prep smootherâ„¢ - 3.4 fl oz/100 ml