UV rays are strongest in summer, at higher altitudes and closer to Ecuador. Their damaging effects are increased with the wind and the reflection of water, sand and snow. Even on cloudy days, UV radiation reaches Earth.

There are three types of UV rays: UVA, UVB and UVC. UVA (long wavelength) are responsible for immediate pigmentation of the skin and the tanning of delay. Penetrate slowly into the deeper layers of the skin and cause changes in blood vasculature, spots, skin aging by destroying collagen, which provides elasticity to the skin, and precancerous lesions (actinic keratosis), although often considered harmless .

UVB (medium wave length) has increased slightly in energy but penetrates the skin. The effects are cumulative, long-term and are responsible for burning, increasing the thickness of skin and skin cancer.

And the short UV or UVC, are the most aggressive, but they do not penetrate the ozone layer because they are absorbed by the atmosphere and held there.

Most sunscreens block ultraviolet B (UVB) and allow the passage of UVA to achieve skin pigmentation. Only in the case of sunscreens that act as sun-protection screens totally blocked the effect of these radiations, to protect those who by the nature of their skin, the exacerbation of allergic processes in contact with the sun or be on medication, be fully protected from the sun.

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