Who doesn’t love a buy one, get one free deal? Well, think of bi-phase skin care as a beauty BOGO: You get two distinct products that are great on their own, all rolled up into one ultra-effective product. You’ve probably heard the term bi-phase before, but might not know what it means. Well, let us clear it up for you: Bi-phase beauty products typically pair two distinct compositions, or “phases,” into one very hardworking formula.

Confused? Think about a salad dressing —it contains oil and vinegar, which stay separated until you shake them up and combine them to create a complete product. Each of those two ingredients has its own molecular composition and density, so one won’t dissolve into the other unless it’s forced to by some external factor (like, say, you shaking the bottle).

The same goes for your beauty products. And when you combine the two by shaking them before you apply, you ensure that you’re getting the benefits of both compositions with the simplicity and convenience of a single, foolproof step. The key word there is shake — while the ingredients are great on their own, in order to get those dual formulas, you need to physically combine them, otherwise you’re just getting one part of the equation.

One component that almost always makes an appearance is oil, which has a lower density than water-based formulas and therefore usually floats. What that means: No matter the pairing—oil and acids, oil and botanical extracts, oils and active ingredients, oils and all-of-the-above—there’s always some moisturizing benefit and a way to seal that in. (While other ingredients penetrate skin, oil’s larger molecules remain closer to the surface and trap nutrients inside.)

“That’s great,” you might be saying, “but why separate them in the first place?” Well, there are a lot of benefits to this method, the most important of which is that it allows you a one-of-a-kind treatment you can’t get by layering multiple products. Bi-phase formulas also allow formulators to create two highly concentrated formulas without having to dilute them with fillers like binders and emulsifiers. This translates to a more potent product that’s composed only of ingredients that actually, you know, do something for your skin.

With all that in mind, it should come as no surprise that the latest addition to Glow Recipe’s Watermelon Glow lineup, the Glow Recipe Watermelon Glow Ultra-Fine Mist, offers a bi-phase combo of nourishing oils and powerful actives.

The top layer of this multitasking fog mist is a blend of nourishing watermelon seed, rice germ, and pumpkin seed oils. The second component is a blend of potent actives, featuring 84% vitamin-rich watermelon extract, clarifying apple cider vinegar, moisturizing hyaluronic acid, centella asiatica to soothe, and exfoliating alpha hydroxy acids. Together, they deliver smoother, brighter skin without the hassle of piling on multiple products. And it’s versatile, too: Use it as hydrating toner, to soften and refresh skin throughout the day, and to add a healthy, makeup-enhancing glow.

Just shake it up, spritz it on, and get ready to glow.