Become a pro in just one minute! What are SPF and PA?

SPF is an indicator of protection against ultraviolet B rays (UVB).

You often see labels like "SPF50" and "PA++++" on the packaging of sunscreen products.
This is a very important keyword for protection against UV rays.

SPF stands for "Sun Protection Factor." In Japanese, it means the effect of protecting against ultraviolet rays, and it is used as an indicator to protect against ultraviolet B rays (UVB), which cause sunburn (sunburn that makes the skin red).
The higher the number, the better the protection against ultraviolet B rays (UVB), and it is displayed as a maximum of 50+ (SPF greater than 51).
However, if you don't apply sunscreen properly, you won't be able to achieve the effects indicated by the numbers.
If the application is too thin or uneven, you will not get the full effect, so please be careful.

PA is an indicator of protection against ultraviolet A rays (UVA).

PA stands for "Protection Grade of UVA." As the name suggests, it is an indicator that represents the degree of effectiveness in protecting against ultraviolet A rays (UVA).
Previously, there were three levels: "PA+", "PA++", and "PA+++". However, with revisions to the measurement and display methods, there are now four levels, including "PA++++".
The more plus signs there are, the higher the protection against ultraviolet A rays (UVA).
Ultraviolet A rays (UVA) are said to be significantly involved in the development of age spots and wrinkles.
Because of their longer wavelengths, these rays penetrate deep into the skin and have various effects.
Because ultraviolet A rays (UVA) can easily penetrate clouds and windowpanes, it's essential to protect yourself from them even on cloudy days or inside a sunny house.