Redken Extreme Length Treatment is a rinse out mask that targets and prevents breakage at the scalp and lengths for longer, stronger hair. The five-minute mask is formulated with Redken's strongest length care complex and contains high quality ingredients such as Biotin, Niacinamide and Castor Oil to promote a healthy, nourished scalp and stimulate hair growth making hair 2x stronger in a single use and visibly reducing split ends by 68%. The formula also contains a combination of cationic surfactants, silicones, and glycerin to immediately transform the hair without added weight.