Sulwhasoo's Overnight Vitalizing Mask EX, a popular Korean skincare product designed to deeply nourish, hydrate, and revitalize skin while you sleep. This mask uses Korean traditional herbs like Scutellaria root and walnut extract, creates a soft 'Organic Respiration Layer' (ORL) to lock in moisture, and leaves skin glowing and refreshed by morning when rinsed off with lukewarm water.