By Sarah Kinonen, Allure
We all know how important it is to slather on sunscreen before heading outdoors, but did you know that it's equally — if not more
— paramount to apply SPF even when you're inside? Or that you really
should be reapplying about every two hours? Because the hard and fast
rules of UV protection are often blurred, we've reached out to
dermatologists to find out the truth behind sunscreen, when to wear it,
and for how long.
1.
Sunscreen should be worn daily, no matter your location — indoors and outdoors.
"Completely
indoor activities don't require sunscreen, but many of us discount the
sun that we get on a daily basis from just running errands and all the
'incidental' sun damage
adds up," explains Elizabeth Tanzi, founder and director of Capital
Laser & Skin Care and associate clinical professor, department of
dermatology at the George Washington University Medical Center.
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why we recommend daily sunscreen application, so you are always
protected and don't have to think about it."That means even if
you spend most of your day indoors, says Ava Shamban, a dermatologist in
Los Angeles: "Indoor UV exposure can occur from ultraviolet that
penetrates through glass, which is UVA. UVA is emitted at the same level
— all day long — where is UVB, which is blocked by glass peaks
mid-day."
2.
For everyday wear, sunscreen should be applied to the face, as well as other areas of concern.
Sunscreen
should be worn on all over the face, ears included, recommends New York
City-based dermatologist Debra Jaliman. "Cover your entire face with
sunscreen, as well as your neck and hands," she says. "If you're not
sweating a lot, you can just apply it first thing in the morning."
3.
The magic SPF number is 30.
"The
American Academy of Dermatology always recommends an SPF of 30, because
it is clinically proven to be a sufficient amount of protection to
reduce or minimize the adverse effects of sunlight," says David Colbert,
a New York City dermatologist.
Joshua Zeichner,
director of cosmetic and clinical research in dermatology at Mount
Sinai Hospital in New York City, adds that when used properly, there's
little difference between a sunscreen with SPF 30 or something with
higher protection. "However, in the real world, we do not apply as much
sunscreen as we should, and we do not reapply," Zeichner says. "This
ultimately means that the SPF value is diluted out. Starting out with a
higher SPF to begin with serves as a safety net to ensure the highest
quality of protection for the longest period of time."
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4.
You should reapply every couple of hours.
"Ideally,
sunscreen should be reapplied every two hours, or more frequently if
you are swimming or sweating heavily," says Zeichner. "The best time to
apply sunscreen is before you go outside because there are [fewer]
distractions and you can make sure that you have adequately covered all
exposed skin areas."
As for how much, Tanzi recommends about a
thin layer on both the face and body, which equals a shot glass's worth
for the entire body and a dime-sized dollop for the face.
5.
Mineral sunscreen is dermatologist-recommend.
Blame it on chemical sunscreens' controversial ingredient list (and how its harming the world's coral reefs), but dermatologists seem to all agree that mineral sunscreen is your best bet for sun protection.
"I
really like mineral sunscreen formulas with zinc and titanium because
they're natural ingredients," says Tanzi. "These physical sunscreens sit
on the surface of the skin to deflect the rays." Even better, mineral
formulas are better suited for those with sensitive skin, as they don't
irritate skin. (We like this Best of Beauty-winning formula: the Alba Botanica Very Emollient Mineral Sunscreen Fragrance Free Broad Spectrum SPF 30
6.
Your clothes can count as SPF, too.
Sun
protection doesn't just involve slathering on sunscreen. "Be sure to
wear sun protective clothing, hat, and sunglasses," says dermatologist
Amy B. Wechsler. "I know I sound like a maniac, but UV exposure is the
number one cause of premature aging in the scan as well as skin cancer."
7.
Your lips need protecting, too.
"People
forget to protect their lips and skin cancer in this area can be
particularly dangerous," says Tanzi. " Everyone needs lip balm with
SPF." (Our pick?
