According to the brand, the mask aims to strengthen the skin’s acid mantle via a potent cocktail of repairing ingredients like niacinamide, sodium PCA (a naturally occurring component of skin that helps attract water), plant-derived squalane, ceramides, omega fatty acids, and powerful antioxidants . Judging by the name, I expected a clear, watery texture similar to Laneige's Water Sleeping Mask , but it actually feels more like a rich, bouncy gel-cream. I used it as an overnight mask layered on as the final step in my PM routine, and it readily absorbed with no hint of heaviness — and it didn't break me out, either.