The summer is finally over, and the autumn weather is coming. The sun is no longer so hot, no longer as fierce as the fist of the tyrant. You can go out without sun protection.
NO, NO little fairies, for your white skin, still insist on sunscreen. .
A large part of the cause of skin aging is due to UV rays, so you should pay attention to sun protection all year round.
In fact, the most sunscreen Jiafabao is a hard sunscreen. Yes, you are not mistaken, The best way to prevent skin from being exposed to the sun is absolutely sunscreen. Long sleeves, trousers, hats, masks, sunglasses, headscarves, and umbrellas are all equipped. This is not afraid of sun and sun. La la la ~
Which material has a good sunscreen effect
In general, sunscreen effect: polyester fiber> wool, silk, nylon> cotton, rayon.
It should be noted that when the clothes are wet, the UPF value will drop, so if the sweat is soaked, the sunscreen effect of the clothes will be greatly reduced.
UPF is the abbreviation of English Ultraviolet Protection Factor, which is the UV protection factor. The higher the UPF value, the better the UV protection effect.
Polyester fiber is the hardwear of the hard sunscreen industry. Therefore, the summer skin and clothing on the street are also made of this material. The sunscreen effect is really good. It is too stuffy and airtight. The sweat can be smashed into the stream…. However, it is raining as a raincoat. Also good~~
Hard sunscreen is not perfect, summer sun is good, you try in winter, it is estimated that it will attract many strange eyes. In addition to summer, we still focus on sunscreen.
What type of sunscreen is selected
Sunscreen ingredients can be classified into physical, chemical, and biological sunscreens according to principles.
Physical sunscreens are mainly titanium dioxide and zinc oxide, which act through physical shielding. It is difficult to add these physical components in a large amount of water and spray, so they can only stay in the cream emulsion. However, because of safety, it is recommended to use sunscreen cream or milk on the face.
Chemical sunscreen, the main principle is to use various chemicals to absorb ultraviolet rays, common with p-aminobenzoic acid and its derivatives, cinnamate , benzophenones, etc. Chemical sunscreens are light in texture and strong in transparency. Both water and sprays use them. The disadvantage is that the risk of skin allergies is higher. Therefore, these two types of products are recommended for body sun protection.
Bio-sunscreen, in addition to Vitamin C, Vitamin E, Selenium, and Coenzyme Q10, is basically a XX plant in various advertisements. Animal extracts generally have an antioxidant effect, which can inhibit the inflammatory reaction caused by ultraviolet rays on the skin and reduce sun damage.
How to choose a sun protection index
Sun Protection Factor, abbreviated as SPF, refers to the production of sunscreen-protected skin. The ratio of the energy required for the minimum erythema to the energy required to produce the same degree of erythema on the skin without any protection. Simply put, it is the time multiplier of the skin against UV rays.
Sun Protection Index=Minimum erythema dose (after sunscreen)/minimum erythema dose (before sunscreen)
SPF value 30 sunscreen finger It is that 3.3% of the ultraviolet rays will reach the surface of the skin through the sunscreen, indicating that the effect of blocking ultraviolet rays is 96.7%. A sunscreen with an SPF of 50 effectively filters 98% of the UV rays. Therefore, although 30 and 50 sound very different, the difference is actually only 1.3%.
What is the PA value?
PA value is the abbreviation of Protection UVA. The defense effect is divided into three levels, namely PA+, PA++, PA+++. In 2013, PA++++ was added.
PA value represents the ability of UVA to inhibit skin aging, loss of collagen, and skin cancer. The more plus, the stronger the defense.
For those who are too lazy to choose or not to choose, it is recommended to use SPF>30, PA+++ products throughout the year.
Sunscreen products should be used 20 minutes before going out. The amount of application is about one dollar coin size. In addition, sunscreen products should be replenished once every 2 hours to maintain their effect. When sweating is more, you can speed up to 1 hour.
Because UV rays can be reflected in sand, concrete, and snow, if you are in these environments, you need high-intensity sun protection.
The sunscreen is good, Gaofu Shuai can’t run!