Most of the UV rays are reflected by the stratum corneum of the skin and only a small part of them comes in the deeper layers of the epidermis. Ultraviolet rays are divided into UV-A, UV-B and UV-C according to their wavelength. The wavelength determines the depth of skin penetration. UV rays are divided into:
UV-C (these rays are harmful to the skin, are retained by the ozone layer)
The first hours of the morning and before sunset are rich in ultraviolet B and A, which stimulate the activity of melanocytes.
Melanin is that they produce a defensive shield of our body against the damage that these rays can result if exposure to light is intense and uncontrolled (erythema and UVB sunburn and premature skin aging UVA).
In particular, UV-B type cause damage to the DNA of skin cells, increasing the risk of melanoma. Those of type A penetrates deep into skin and alter the collagen and elastic fibers, favoring the appearance of wrinkles and speeding up the process of skin aging. A formula to remember is valid for any skin type is: “by degrees, in just hours, protected.” Leather is a durable fabric, but in some ways and gentle rays of the sun have a beneficial only if carefully measured and therefore can be very dangerous.