Looking for comfort under a shoreline umbrella or a shade close to the pool doesn't mean you're getting satisfactory security from the sun. Why? Sand and water both reflect harming beams, and 34% of UV radiation traverses when you're under a shoreline umbrella, "so regardless you need to apply sunscreen in case you're sitting under spread," says Dr. Graf. Regardless of the fact that you don't get a sunburn, despite everything you're getting UV introduction.