Do many of us not we enjoy a beautiful sunny day? In general, we have a good perception of the Sun, because we enjoy a warm weather and summer, especially when it comes to outdoor activities. The Sun is an essential element for life on the planet and has positive effects on our body, as for example the stimulation of the synthesis of vitamin D. But rarely are aware of the damage-causing sun rays on our skin; even though the effects are not visible immediately or in the short term, the damage accumulates with the passage of time. Solar energy, also known as ultraviolet rays (UV rays), affect from the outermost layer to the deeper layers of the skin. Many times the skin changes attributed to the old, such as wrinkles and dark spots, are consequence of prolonged exposure to the Sun. This type of premature aging is caused by the incidence of solar rays into the layers of skin, which impairs the production of collagen, frees radicals libres and inhibits skin self-healing mechanisms. Ultraviolet rays are also considered as the environmental factor of increased risk in the occurrence of skin cancer, which is the most common cancer in the United States. This is one of the reasons why in recent years the sunscreen has become so important, beyond the merely aesthetic consequences. But this does not mean that we can not seize the sunny days, or that we have to stop enjoying the summer, simply must take certain precautions to prevent damage from the Sun on the skin.