General methods of sun protection: applying sunscreen products, using items such as sun-protective clothing, eating sun-protective foods, etc.
Sun protection products are divided into physical, chemical, and biological sun protection; where the level of sun protection index reflects the level of UV protection of sun protection products.
UV rays are divided into three types according to their wavelengths.
UVA: The longest wavelength of ultraviolet light, not absorbed by the ozone layer at the top of the atmosphere, can penetrate the dermis, more deeply than UVB skin. So skin tanning, and lead to lipid and collagen damage, causing skin photoaging and even skin cancer, so UVA will not only stimulate pigment synthesis and make the complexion "dark" but also it is the main cause of skin "aging" and fine lines.
UVB: Medium-wave ultraviolet light, which can reach the dermis and cause sunburn, redness, and tanning, but most UVB is absorbed by the ozone layer and can be blocked by glass, umbrellas, clothing, etc.
UVC: UVC will be almost completely absorbed by the atmosphere and only very rarely will we run into it.
How to protect yourself from the sun when you go to the beach
1. Choose a sunscreen with a high sun protection factor
How do you protect yourself from the sun when you go to the beach? The higher the SPF value, the more sensitive and greasy the ingredients are, and the greater the burden on the skin, but if you stay at the beach for a long time or go diving, you must use SPF 50 sunscreen.
2. Reapply sunscreen every hour
Don't think you can stay at the beach with sunscreen on, it needs to be applied 20 minutes before you go out to work, and you need to reapply sunscreen every hour.
3. Dry your body after going into the water and then apply sunscreen.
Go to the beach will certainly go to play with the water, but after coming up, it must be busy drying the moisture on the body, and apply sunscreen, because the moisture on the surface of the skin will also absorb ultraviolet rays, if not dried in time, it will be more likely to be tanned.
4. 72 hours golden repair period after sunbathing
If you forget to protect yourself from the sun because you're having too much fun, then you must repair your skin 72 hours after sun exposure to avoid spots, your skin becomes fragile after UV exposure and needs to be cooled and calmed down, and hydrated, use an ice towel on your skin for 15 minutes to cool it down, then use a makeup mask on your face to replenish moisture for your skin, then apply moisturizer.
About sunscreen ingredient
The active ingredients in sunscreens can be divided into two main categories: chemical (such as avobenzone or oxybenzone) and physical (zinc oxide, titanium dioxide). If you are concerned about chemical ingredients, especially if you have sensitive skin, choose a physical sunscreen for safety and security.
