Here's what that number on every bottle of sunscreen actually means
- Sunscreen is essential for protecting our skin from harmful UV rays — not only in the summer, but all year long.
- This sun-blocking lotion is made from a combination of inorganic chemicals that deflect UV rays and organic chemicals that absorb UV rays.
- SPF stands for "sun protection factor" and the number is related to how long it takes for potentially damaging UV rays to affect your skin.
- Here's everything you need to know before you hit the beach this summer.
EDITOR'S NOTE: This video was originally published on July 5, 2016.