There are many reasons, but the main reason is to prevent oxidization and to keep the active ingredients stable. Airless pump technology maintains the integrity and efficacy of anti-aging and natural ingredient creams, serums, toners and makeup. Provides non-hygienic dispensing. Trying to remember whether it's a dime-sized or a quarter-sized amount of product isn't fun, especially if you're short on time in the mornings or too tired at the end of the day to care about a "skin care ritual." Airless pump packaging solves that problem by dispensing the precise amount of product. For example, a single pump of the clarifying treatment may be all you need for those chin break outs. Half a pump of the radiance eye cream is enough to cover the delicate skin around both eyes. Using too much eye cream can cause stubborn milia bumps around the eyes (guilty of this!). Reap the full benefits of this skin-friendly and user-friendly airless pump dispenser and buy now!.