ULTRA HD SKIN BOOSTER HYDRA-PLUMP SERUM 12 ml - 0.40 fl.oz. A hydrating face serum that preps skin for makeup and smooths the appearance of fine lines. Used to perfect the skin before makeup application, this serum is a staple in pro makeup artists' kits. It works to give skin a plumped appearance and boost radiance for a flawless complexion, and can be used alone or mixed into foundation for a healthy, dewy finish.