New York Post Composite This Korean SPF delivers silky, weightless protection that keeps my sensitive skin calm while fitting easily into my everyday routine. SPF is the skincare category I test the most, and also the one I’m most committed to, because sun protection is something I treat as essential, no matter what else is going on in my routine (your dermatologist would say the same!) I even flew all the way to Korea to gain education inside a beauty formulation lab. There, I learned how the quality sunscreen systems of K-beauty are built from the ground up. That experience completely diverted how I evaluate SPF, especially when it comes to filters, emulsions and how formulas behave on real skin throughout the day. While I was there, surrounded by innovative textures and carefully engineered products, the Round Lab Birch Juice Moisturizing Sunscreen SPF 50+ PA++++ was one product I knew I needed to take home with me.…