Using sunscreen is always important on hot days, but especially when we hit the century mark. However, picking the right protection can get confusing. Iris St. Meran has more.

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SYRACUSE, N.Y. -- On very hot days like Tuesday, sunscreen is a must if you plan on spending time outdoors.

Experts say you should re-apply lotion every two to three hours, or more if you plan on being in the water.

"Application of the sunscreen. You know you're going to have activity in the sun, you know you're going to the beach and swim, apply it a half hour before. And maybe an hour or two afterwards you should apply," said Dr. Fuad Farah, Upstate Medical University Professor of Medicine.

Dr. Farah says to make sure the SPF on your sunscreen is at least 15, but it doesn't have to be over 50.