Monat Jumbo Double Action Hydrating Serum Spray | 3x15ml | Vegan & Cruelty-Free A leave-in treatment for dull, lifeless thirsty hair, that combines long-lasting hydration with body-building ingredients to restore hair vibrancy, bounce and shine! This serum is no light weight! Looks can be deceiving. Don’t let the fluid, ultra-lightweight texture fool you. In fact, it is our advanced hydrating super star! With just a few quick shakes, the two phases become one, transforming the contents of each vial into a milky hydrating power surge, ready to quench thirsty hair strands with moisture replenishment from the inside-out.