In the minds of ordinary people, wearing light-colored clothes in summer is sun-protective and cool, so when summer comes, light-colored clothes are everywhere. Recently, American scientific researchers concluded through experiments that in hot summer, wearing dark clothes has a better sun protection effect!
In fact, black should be cool. People think that white is cool only because of the psychological effect and has no physical theory. Human skin emits heat in two forms: perspiration and infrared radiation. Black cotton clothes can not only absorb sweat but also absorb most of the heat. Infrared rays radiated by the outside world and the human body. Therefore, relatively speaking, white and other light-colored clothes emit infrared rays, which is detrimental to the body’s heat dissipation. Wear red clothes for sun protection in the summer. This is because the red light wavelength can absorb a large amount of ultraviolet rays in the sun, while other colors are relatively weak. Therefore, wearing red clothes in the summer can block ultraviolet rays and prevent the skin from being sunburned.
Previously, the Textile Department of the American “Good Housekeeping” Research Institute tested summer clothes on the market and found that most clothes had little protection against ultraviolet rays. Contrary to what people imagine, white clothes have poor UV protection. For example, a white cotton T-shirt only has an SPF value of 5-7. In comparison, dark clothes have stronger sun protection.
In addition, a study by Harvard University in the United States also showed that in hot summer, wearing black clothes is cooler than white clothes. This is because the body’s heat can be dissipated through radiation, conduction, convection and evaporation. Although black clothes absorb more heat than white clothes, the heat absorbed can become the driving force for air convection in the clothes. Just like in the summer afternoon, when the ground is heated, it is easy to form local convection and even bring about thunderstorms. The air convection in clothes can also take away sweat and part of the heat from the surface of the skin, making the human body naturally feel cooler.
Experts also emphasize that dark-colored clothes should be looser, which can enhance “convection”. In addition, research also shows that after sweating, the sun protection ability of a T-shirt will be reduced by 1/3, and the same is true for dark-colored T-shirts. Therefore, choosing a pair of dry, loose-fitting dark clothes can help you survive the hot summer.
Sun protection clothing is generally divided into three types:
1 Colored cotton fabrics, bright colors such as red and blue have a high isolation rate against ultraviolet rays;
2 Sunscreen fabric means adding sunscreen additives to the fabric. If there are special needs, the fabric can be post-finished, which means the fabric density is higher;
3 Special fabrics, such as silver reflective materials, etc.
As far as color goes, the darker the color, the higher its UV protection properties.
In terms of texture, among chemical fibers, polyester > nylon > rayon, silk;
Among natural fibers, flax > hemp > cotton.
Most of the sun protection clothing currently on the market has sun protection additives added to the fabrics, or ceramic micropowder is used to combine with fibers to increase the reflection and scattering of ultraviolet rays on the surface of the clothing. Good sun protection clothing can not only block ultraviolet rays, but also quickly guide sweat to the surface of the fabric and dry quickly. Inferior fabrics have poor moisture absorption and breathability, making people feel uncomfortable when worn for a long time.
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