Modern technology allowed them to stand in one row with creams for daily use to prevent photo-aging. Moreover, modern high-speed travel, allowing a few hours of fog and snow transported into the sun's edge, leaving the skin too little time for adaptation. The number of harmful factors acting on the skin and accelerate its aging, very large. All of them are depending on our behavior are to a greater or lesser degree, but there is a factor in effect on the skin almost constantly - is the UV radiation. It was with him, according to most scientists, linked the first signs of aging in the open areas of skin. It is believed that ultraviolet rays in the skin triggers the degenerative process, resulting in the skin gradually loses its tone, becoming more dry and rough, and shows the wrinkles and pigment spots. That is how the skin is protected from excessive sun exposure. The cells of the skin, received a dose of UV, give the command pigment cells to produce black and brown pigment melanin, which protects the skin from excessive damage. In constant contact with the sun protective resources are being depleted skin, because to explain why you would need a cream containing sun filters, we will not. It's better to learn to read "encoding" of these funds and start with the simplest ... What shows the SPF? SPF - an acronym for sun protective factor (sun protection factor). The number next to the familiar SPF shows how many times longer than the time you can stay in the sun without skin redness (erythema) during the preliminary application for the sunscreen product compared with the stay "unprotected skin. For example, if you can usually tan to skin redness quarter of an hour, then after drawing tools with SPF 8, you can extend this time to two hours. There are also specially designed table solar security (see Table.), Which shows the required SPF in a different climate. At the level of SPF you can also determine the level of protection against UV-B. Thus, SPF 2 provides 50%, SPF10 - 90%, SPF25 - 96%, while SPF50 - 98%. What determines the SPF? There are physical and chemical protective filters, which are part of sunscreens. Physical (eg, titanium dioxide and zinc oxide) is a very fine powder having a particle size, which allows you to fully reflect all the ultraviolet rays. Since such particles scatters visible light is minimal, then the emulsion with a physical filter, colorless and not visible on the skin. Chemical filters capture ultraviolet light, changing under its influence, transforming solar energy into harmless to the skin warm. These filters are: oktilmetoksitsinnamat - the most used today, a filter that provides good protection against UV-B and UV-A, benzophenone-3 - also filter a wide range of activities, para-aminobenzoic acid (PABA) - from which many manufacturers have already given up and put on a specially packages PABA-free, 4-izopropildibenzoilmetan, butilmetoksidibenzoilmetan, benzophenone-4, metilantranilat. The disadvantage of these filters is that they can cause allergies, or conversely, exacerbate it. It should be noted that the risk of dermatitis and photo-dermatitis rather low, only 0,1-2,0%. However, before using sunscreen, apply a little substance on the inside of the elbow and leave it there for half an hour to ensure no skin irritation. The second disadvantage of this type of filters - a gradual deterioration of the properties of matter from the sun, which requires re-applying means every 2-3 hours. Selection rules What options other than SPF, need to consider when choosing a sunscreen: * Shelf life of cream, * Water resistant means it or not (better to buy water repellent); * Marking Water Proof - indicates that the SPF sunscreen does not decrease after 80 minutes of swimming, Water Resistance - SPF does not change after 40 minutes of swimming, * Availability of resources of various active ingredients - mitigating additives to retain moisture in the skin, antioxidants to protect skin from oxidative stress, nutrients, vitamins, etc. What's new? Over the past 10 years, sales of sunscreens continues to grow. On store shelves you can find hundreds of different drugs as a world-renowned cosmetic corporations and small local companies. In addition to traditional creams and lotions designed new forms and types of sun protection cosmetics, such as sticks or sprays. The latter is universally recognized for its ease of use and good distribution of the drug on the surface of the skin. There are also drugs that not only protect the skin from burns, but also to smooth out wrinkles, giving a mild lifting effect. For example, a cosmetics series Golden Skin (VIRUD, Germany) made in the form of dry sun protection oils, quick-drying on the skin after application of the insensible and are resistant to water. They soften the skin, making it smooth and silky, suitable for all skin types and do not have the effect of sticky after application. Unique structure enables the tube evenly, easily and quickly spray the product at any convenient angle. Warning Colored! It is believed that the chemical tanning or avtrobronzaty (means, giving the skin a bronze color) prepares the skin to perceive harmless natural tan, reducing the risk of sunburn. This is absolutely not true! Under the influence of ultraviolet radiation in the skin increases the synthesis of melanin - the natural pigment, which imparts its dark hue. It was he who protects the skin from UV rays. Chemical protective tan in such property does not possess. Therefore, if you go to the beach flaunting his own established tan - the use of sunscreens must! In conclusion, when the cream is already selected, purchased and ready to use, I would like to remind you that, firstly, sunscreens should be applied to the skin in sufficient quantities - 2 mg per 1 sq. cm Consumption is about 4 tablespoons of the body.