After the summer heat, many MM finally a sigh of relief, no longer have to worry about sunscreen, no longer have to put on sunscreen, wear sunglasses, play the umbrella … armed to go out. In fact, it is not, autumn and winter sun protection is as important. No matter in any season, you can not ignore the UV protection. The UV rays are irradiating all year round, and if you are not careful, your fair and clear skin will gradually lose its brilliance. There is a classic saying that “UV is the enemy of beauty!” Long-wave ultraviolet UVA and medium-wave ultraviolet UVB can not be seen or touched, but they do penetrate the skin and cause damage to the skin. Long-wave UVA is always present during the day, even under cloudy or overcast conditions, and even indoors, UVA can come in directly through glass, so daily UVA protection is essential to prevent hyperpigmentation and photoaging, even when people are indoors. Those who need sun protection are advised to use broad-spectrum sunscreens that offer good protection against both types of UVB rays in different seasons of the year. When it comes to sun protection, it is important to talk about “SPF”. The SPF (Sun Protection Factor) is an indicator of the sun protection function. SPF represents the time that the sunscreen protects the skin from sunburn and redness under UVB exposure. Generally speaking, the SPF used on weekdays is above 18 and applied 20 minutes before sun exposure is most effective. For prolonged outdoor activities, it should be above SPF 30 and should be reapplied every 2-3 hours. In addition, because of the awareness of UVA in recent years, people are more willing to choose products with anti-UVA function. The ideal sunscreen should be SPF 25 & PA + + +. It is important to protect yourself from the sun in autumn and winter. When you go outside to enjoy the sunshine, you need to apply protective products to the parts exposed to the air even when it is colder in winter. You can also eat foods that can protect against UVA and UVB, such as vitamin C and vitamin E, which have antioxidant properties, and green and black tea are also foods with good antioxidant properties.