The sun protection index of skin clothing is mainly checked through the following aspects:
1. View UPF value: UPF value is an abbreviation for UV protection index, representing the ability of skin clothing to protect against UV rays. According to the standard, skin garments with UPF values above 40 can effectively block 97.5% of ultraviolet radiation. When purchasing, one should pay attention to the UPF value on the product label or tag to screen for skin clothing that meets their needs.
2. Understand SPF and PA values (although these values are more commonly used for sunscreen, some high-end or specifically designed skin garments may also be labeled): SPF value: measures the protective ability of sunscreen products against UVB ultraviolet rays. UVB is one of the main ultraviolet bands that cause sunburn and skin cancer. The higher the SPF value, the better the sun protection effect, but there is no non-linear relationship, for example, SPF50 is not 20 times more protective than SPF30. PA value: A commonly used indicator in Japanese sunscreen products to measure their ability to protect against UVA ultraviolet rays. UVA is the main ultraviolet band that causes skin sunspots and skin aging. PA values have levels of+,++, and+++, with higher levels indicating stronger protection capabilities. Note: Not all skin garments will be labeled with SPF and PA values, which are more commonly found in products such as sunscreen.
3. Actual wearing test or professional test: Actual wearing test: Wearing skin clothing outdoors in strong sunlight for actual testing, observing whether there are signs of redness or sunburn on the skin. If the skin condition is good, it indicates that the sunscreen effect of the skin garment is good. Professional testing: If possible, professional equipment such as UV testers can be used to test the sun protection effect of skin clothing before and after purchase. By comparing the test results, we can more accurately understand the sun protection performance of skin clothing.
The sun protection factor of skin clothing mainly depends on the UPF value on the product label, and its sun protection effect can be further verified through actual wearing tests or professional tests. For SPF and PA values, although they are more commonly used to measure the sun protection performance of sunscreen, they can also be used as references when choosing high-end or specifically designed skin clothing.