I don't know if everyone has such a feeling, why they have just entered the futian, they have begun to look black for a few degrees. Some are, summer is coming, the sunscreen is also wiped, how can it still be tanned? In fact, I don't want to do more explanation, sunscreen can not distinguish between sunny days, rainy days, snow days, sunscreen is every day of daily life. More importantly, serious sun protection can also make our skin principle photo-aging brought about aging, as long as the skin anti-aging is done well, the boyfriend is definitely in the college entrance examination.
Ø Who tanned us?
Sunscreen is mainly to prevent the sun's ultraviolet rays from causing damage to the skin, otherwise it will be tanned in a few days. What is the culprit of sunburned skin? Ultraviolet rays can be divided into long-wave ultraviolet UVA, medium-wave ultraviolet UVB, and short-wave ultraviolet UVC according to wavelength. The main damage to our skin is UVA and UVB.
Because UVC can be completely absorbed by the ozone layer, it cannot reach the ground. UVB can reach the superficial dermis of the skin, mainly causing skin sunburn, erythema, blisters, etc.; UVA can penetrate deep into the dermis layer of the skin, mainly causing skin tanning, aging, wrinkles, sagging skin, etc. UVA penetration is strong, whether it is clouds or glass can not completely block UVA, and the proportion of UVA in winter will rise, so all year round, whether indoor or outdoor, whether sunny or cloudy, sun protection is required.
Ø How to choose sunscreen products?
Sunscreens are usually marked with SPF and PA values, and SPF mainly represents the ability to protect against UVB. Under the same conditions and with correct use, the same erythema is produced, and after using a sunscreen product with SPF 15, the exposure time in sunlight is 15 times that of the unused sunscreen product.
SPF50 products require 50 times more exposure time to produce the same erythema than unused sunscreen products. The PA value mainly represents the level of UVA protection, with + indicating different protection levels, and the more + signs represent the higher the protection level. Just like Dr. Marne platform Schiff Hydra Moisture Isolation Protective Milk Sunscreen Isolation Two-in-One, bounce off ultraviolet rays and build a skin-friendly protective layer.
Want a full range of sunscreen, in addition to applying sunscreen, sunscreen clothing, sunglasses, sun umbrellas and many other nursing sunscreen artifacts can be selected, want to truly become a white beauty who is not afraid of sun, sunshine is not afraid, then honestly do a variety of sun protection preparations!