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.
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EDITOR’S NOTE: This video was originally published on July 5, 2016.