Powered by French Mountain Water and Hyaluronic Acid that can retain up to 1000x its weight in water, this serum brings intensive hydration deep into the skin. Equipped with Anti-Pollution Particle Adhesion System, the serum forms an invisible "shield" on skin to limit the adhesion of pollution particles, even PM2.5. It protects skin’s barrier and prevents water loss. ADS(TM) Active Defense System, a powerful soothing active ingredient that helps to reinforce skin's natural resistance against daily aggressions.