'Extreme heat may mean using a different sunscreen'

 Are you using the right sunscreen?

With world temperatures reaching record highs this summer - experts say you might need to think twice.

Sunscreens aren't all the same - and during extreme heat - those differences can matter.

There are two major types.

Mineral sunscreens create a physical barrier that reflects UV light before it penetrates the skin.

They're not absorbed, so older formulas often felt greasy - and left that iconic white cast.

Chemical sunscreens form a thin protective film that absorbs UV rays and changes their structure.

If your sunscreen comes in the form of a lighter cream or spray - it might be this.

But according to the American Academy of Dermatology -

you'll want to reach for mineral sunscreens during heatwaves...

when temperatures hit 90 degrees Fahrenheit or above - with high humidity.

That's because chemical sunscreens can lose their filtering abilities when exposed to extremely high temperatures.

And it's not just about choosing the right sunscreen - habits matter too.

Many people only apply about 20% to 50% of the sunscreen they need.

Adults need one ounce of sunscreen, about a shot glass full.

And dermatologists recommend a double layer for your face, or anywhere else that's more exposed.

Sunscreens should usually be reapplied every two hours, and after swimming or sweating.

But you'll be sweating more during a heatwave, so you need to reapply more often.

They also say, leaving your sunscreen out in the heat can decrease its efficacy, so try storing it in a cool dark place.

https://news.yahoo.com/extreme-heat-may-mean-using-202943020.html