Amika Dream Routine Overnight Hydrating Hair Mask is a luxurious no-rinse, leave-in treatment designed to provide deep moisture while you sleep. This lightweight formula absorbs quickly, leaving hair softer, shinier, and more manageable by morning. Formulated to provide long-lasting hydration, this mask helps to nourish and revitalize dry or damaged hair without the need for rinsing. Simply apply before bed and wake up to healthier-looking, revitalized locks.