Camelia Shiseido
April 2015
Tips & Rituals, Other


UV A rays are “aging rays” that penetrate deep within the skin. They are responsible for photoaging effects such as wrinkles and sagging, and as the effects accumulate over time may also increase the risk of skin cancer. UVA rays are equally strong throughout daylight hours and all through the year, and they call for daily protection.

UV B rays are “burning rays” that affect the surface layer of your skin and are responsible for sunburn. UVB rays are strongest in spring and summer months, and between 10am and 2pm. They’re also stronger in tropical regions close to the equator, and at high altitudes.


When skin is exposed to UV rays…

epidermis & UV rays
  • Protective Barrier and moisturizing fonctions decline.
  • Melanin is overproduced and forms spots.
  • Damage builds up, and collagen and elastin break down.
  • Wrinkles and sagging form.

The effect of UV light on skin varies not only by how much UV is directly absorbed by the skin, but also by how much is reflected from the surrounding environment.

Ratio of UV levels with a sunny day set at 100

ratio UV
ratio UV 2



Snow and water have a particularly high rate of reflectivity. Even in weak winter sunlight, snow reflects more than 80% of the sun’s UV rays, resulting in UV levels that are 1.8 times what they would be with no snow. This is why skiing and snowboarding call for special attention – so when you’re enjoying winter sports, don’t forget to use broad spectrum sun-protection products with a high SPF.