Ultimate! Sun Protection Lab Ultimate! Sun Protection Lab

In order to prevent sunburn, it's important to
have accurate information about UV rays
and understand the the right way to use
Get all the information you need here, and be sunburn-free!

Advice on sun protection

The importance of sun protection

UV rays cause
photoaging of skin!?

Prolonged UV exposure is said to accelerate signs of aging in skin, such as dark spots, wrinkles, and loss of elasticity.

It is even said that 70-80% of skin's aging is due to cumulative sun damage over many years.
Aged skin also has less resistance, making it susceptible to UV-induced aging of skin cells.

But too much UV exposure can produce deep wrinkles even in your 20s, which is why it is
called “photoaging” regardless of age.
Compare the inside of your arms with your cheeks.
Doesn't your skin have a finer texture, with less dark spots and wrinkles, on your arms?
That may be because your arms are exposed to fewer UV rays than your cheeks.

Your skin ages not only with time, but also due to the effects of UV rays.


So it's important to be thorough about sun protection every single day!

So it's important to be
thorough about sun protection
every single day!

For the future,
not just the present

Don't drop your guard
even if there are no signs of sunburn at first!

UVA rays

Long wavelength UVA rays do not usually cause sudden changes to your skin, but inflict cumulative damage. As they penetrate deep into the skin, they often even damage the dermis, leading to loss of firmness and elasticity, and causing photoaging. The rating that indicates the level of protection against these UVA rays is PA (Protection Grade of UVA). The number of + represents the amount of UVA protection, in four levels from + to ++++.

UVB rays

UVB rays have a strong impact on the skin, and can cause redness even after short exposure. Short wavelength UVB rays not only cause sunburn and dark spots, but can also damage epidermal cells and DNA on skin's surface. The rating that indicates the level of protection against these UVB rays is SPF (Sun Protection Factor). It is rated on a scale of 2 to 50, and a 50+ rating for anything above, with higher numbers indicating greater protection against UVB rays.

Both types of UV rays can damage your skin
without you noticing,
as there may be no signs at first!
So you might think, my skin hasn't been damaged so it's ok,
but damage may manifest as dark spots and wrinkles after
five or 10 years!


Be sure to check
the SPF and PA ratings
when choosing sunscreen!

UV levels actually
increase from
March or April

In May, UV levels are stronger than in August!

Do you think that “UV protection is just for summer”?
In fact, the amount of UV rays reaching Earth’s surface starts to increase
from March. By May, it reaches a similar level to July, and sometimes even
exceeds that of August! The amount of UV rays that reach Earth’s surface
depends on the angle at which sunlight strikes the ground, and the amount
of cloud cover. Sunlight strikes the surface at an almost perpendicular
angle in June
, yet the position of the sun gradually rises from a few months
before that, so UV levels also increase.


Don't start in summer! Year-round sun protection is crucial!

*Based on the Japan Meteorological Agency's Daily Maximum UV Index (estimate) in Tokyo, 2015

Worse than you think!?
Sunburn on your hair and scalp

How many people don't use sunscreen on their hair or scalp, despite thoroughly applying it on their face and body?
Hair and scalp can also be sunburned if they are exposed to UV rays.
For example, your hair may lose its luster and moisture, and your scalp may become reddened due to sun damage.
Don't forget to thoroughly protect your hair and scalp too!

Hair sunburn Hair sunburn

Prolonged UV exposure damages the proteins that are the building blocks of hair.
Cuticles become prone to cracking.
This causes hair to dry out, potentially leading to problems such as dryness, loss of luster, breakage, split ends, and color fading.

  • Healthy hair (illustration)

  • Standard hair care product without UV protection was applied to hair and exposed to a UV lamp. Cuticles are cracked.

  • CHECK!

    Standard hair care product with UV protection was applied to hair and exposed to a UV lamp. Cuticles are not cracked, and appear similar to healthy hair.

Scalp sunburn Scalp sunburn

Your scalp is also skin, so sun damage can cause problems such as dryness and inflammation, as well as loss of elasticity.
Symptoms such as redness, itchiness, peeling, the scalp feeling stiff, and increased hair loss,
might be the result of sun damage.

Be aware of accidental sunburn
from reflected light & on cloudy or rainy days!

Your skin is not only exposed to UV rays directly from sunlight, but also often to rays scattered in the air and reflected off the ground.
UV umbrellas and hats alone cannot protect against scattered or reflected UV rays, even if they protect against rays coming directly from the sky.
And while clouds block UV rays to a certain extent, UVA rays in particular can penetrate clouds more easily than UVB, so you still need to be careful.
Even with UVB rays, more than 80% can still penetrate if cloud cover is thin, so UV rays can affect us even on cloudy or rainy days.

  • UV ray exposure can come directly from sunlight,
    from scattered light in the air, or from reflected light off the ground.

  • Reflection rate of UV rays on ground surfaces
    Fresh snow 80%
    Sandy beach 10-25%
    Asphalt 10%
    Water surface 10-20%
    Grass or soil 10% or less

    UV rays that reach the Earth's surface get reflected off the ground.
    The reflection rate varies substantially depending on the type of surface.
    (Source: Japan Meteorological Agency)

Prevent accidental sunburn by
effectively using products
such as sunscreen spray.
Give skin the proper UV protection &
reapply regularly!

*1 Highest factor according to national standards, out of all KOSÉ products