Each day, emotional and environmental stresses affect skinÄs barrier function, one of its self-defense capacities. Thus, skin tends to dehydrate, to become more sensitive and uncomfortable: imperfections appear. Lanc?me creates Hydra Zen Serum-in-Mask: overnight intense hydration to reveal your skin tone radiance. Forget the stress, tension and fatigue built up over the course of the day and prepare your skin for a night-time radiance boost. Created to reduce the visible signs of stress, Hydra Zen Overnight Serum-in-Mask penetrates quickly and provides intense hydration.