When the sun is strong, it is best to wear dark cotton clothes, especially dark red, which is the most resistant to ultraviolet rays, followed by black and navy blue, and white is the worst, because white clothes only reflect heat and cannot block ultraviolet rays.

Ultraviolet rays in the sun will not only harm our skin, leading to sunburn, tanning and pigmentation, but also accelerate skin aging, that is, photoaging. Besides physiological aging, photoaging is the most important cause of skin aging. Direct sunlight will not only turn black, but also accelerate skin moisture loss and skin aging, aggravate freckles and breed wrinkles.

Reapply sunscreen every two hours:

The use of sunscreen must be enough to really block long-wave and short-wave ultraviolet radiation. If only the face and neck are exposed, use a spoonful and carefully smear all exposed skin, leaving no dead ends. Swimming and other projects need about 30 grams to protect the whole body skin.

After two hours in the sun, reapply sunscreen. More attention should be paid to waterproof and moisturizing cream for swimming, and the application frequency should be changed to 40 minutes. Pay attention to store sunscreen in a cool place, away from high temperature, and don't put it in the car.

Refer to the above? People's Daily Online-Q&A: Is the sunscreen effect of white clothes better?