Benefits The Hydra Cool Serum 15ml is ideal for those on the go. It is formulated to rejuvenate, hydrate, and soothe the skin. This refreshing serum combines superior antioxidants with essential botanicals and bionutrients. Excellent for relieving the sting of sunburn and the burn of freshly shaved skin, HYDRA-COOL SERUM is anti-acneic as well. HYDRA-COOL SERUM is designed for all skin types and for all ages and is gentle enough for even the most sensitive skin.