SPF is one of the best ways to prevent signs of aging since it's a cumulative effect of UV damage that leads to fine lines, age spots, rough patches and a loss of elasticity. UV damage can still occur when it's cloudy out, so choosing an SPF that feels like a moisturizer, acts like a primer, or doesn't leave a white cast can help sunscreen serve as a regular part of your routine versus something you only use at the pool.
For more, check out this post where we break down everything to know about SPF.
Learn more about K-beauty, here's our K-beauty Glossary.