Discover Biolage Deep Treatment HydraSource Multi Use Hair Mask for instant gratification and total hair transformation. Highly concentrated in caring agents for healthier-feeling hair with each use* Infuse extremely dry hair with moisture and nourishment. Hair is less prone to breakage, feels soft and looks and feels healthy. Small but mighty, each pack contains at least four applications. Easy to squeeze, our packs are perfectly sealed for a fresh application each time. *when used as a system with Biolage shampoo