Bosley Pro Volumizing & Thickening Nourishing Leave-In 6.8 oz. professional Strength Lightweight leave-in conditioner containing anti-aging ingredients and DHT inhibitors.Bosley Pro IMPROVED Volumizing & Thickening Nourishing Leave-In is specifically formulated for fine, thin hair. A lightweight leave-in conditioner containing anti-aging ingredients and DHT inhibitors, it provides thickness and volume, while vegetable proteins strengthen and detangle hair. Alcohol-free and humidity-resistant, it protects against heat and thermal styling. LifeXtend Complex may help support healthy hair function. Fortified with added ColorKeeper helps extend and protect hair color.