The most nourishing and hydrating ingredients to look for in a mask are those with the ability to: Improve the quality of the intercellular cement, which is the role of vegetable oils. The quality of this cement affects the water content of the epidermal cells. If the cement lacks sufficient complex lipids, the water contained within the cells will tend to evaporate too quickly. Retain water on the surface, which is the role of glycerin, a humectant agent with hygroscopic capabilities, honey, which helps retain moisture in the skin while providing essential nutrients, as well as aloe vera, which naturally contains a large amount of water."