The Birch Moisture Sun Cream by ROUNDLAB is not specifically marketed as a fast-absorbing essence, but it does have a lightweight and smooth texture that absorbs quickly into the skin. Many users have noted that it feels like an emulsion and spreads effortlessly without leaving a sticky residue. However, it is important to note that it is primarily a sunscreen with SPF50+/PA++++ protection, designed to provide sun protection while also offering hydration.

If you are looking for a fast-absorbing essence specifically, you might want to consider other products that are formulated as essences rather than sunscreens. However, the Birch Moisture Sun Cream could be a good option if you are looking for a sunscreen that also provides a lightweight, hydrating feel.