Hyaluronic acid has become a buzzy ingredient lately — and for good reason: It holds on to water better than anything else. If your skin has enough hyaluronic acid, it can stay hydrated for days — even in the driest conditions. Products that contain this ingredient tend to be oil-free and gel-like, meaning they’re ideal for oily skin types. Yet they’re so moisturizing, they’re also great for super dry skin. Basically, everyone should have one of these hyaluronic acid moisturizers in their arsenal.