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Bowe used the device for a week this past winter. During an hour-long run outdoors, she said she had already gotten half of her daily UV exposure allowance, according to the device.

\"UVA [rays] actually penetrate through clouds and window glass,\" Bowe said.

UVA rays age skin cells and damage their DNA. They're linked to long-term skin damage like wrinkles but are also thought to play a role in the development of skin cancer, particularly in tanning beds, according to the American Cancer Society. UVB rays are the rays believed to cause most skin cancers, as they are stronger in energy and can directly damage DNA in skin cells.

When to use it

You don’t have to wear the device every day -- although that might be best -- but a critical time to wear it is when the weather is changing, Bowe said.

Knowing your UV max is important because once you reach it, your skin becomes more vulnerable to skin cancer and aging, Bowe said.

\"PHOTO:
La Roche-Posay
PHOTO: My Skin Track UV is pictured in this undated photo.
>

\"Having the awareness,\" she said, \"and being able to get real-time feedback regarding how much sun exposure you’re getting is really helpful when it comes to making lifestyle changes and changing your daily habits.\"

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