The meaning of the number on the sunscreen

pu1. The higher the UV protection index, the better it is

2017-12-17

OK

pu2. Um, it's a bit vague, so it means that once you put it on, it lasts a long time. So, if you look at the blocking rate, it's hard to say that it's good to have a high level

2017-12-17

OK

pu3. I have to apply sunblock often anyway, so I sweat a lot in the summer, so it comes off quickly. I heard that 15 is enough if you apply it often

2017-12-17

OK