I put it on a helmet because it is a forklift driver. If you work outside, you can easily imagine, but in summer it's a heating environment and in winter it's a cooling environment. It is natural to be exposed to the rain, but if it gets dirty, I wash the helmet with detergent and water. I treat it like that hard, but I can not see how the sticker has been hurting in particular. Aren't there any more products?
I am using it in conjunction with other kinds and pasting it on a helmet.
I do not think that size, material and strength are problematic, but depending on people there may be dissatisfaction points.
Would it be better if you correspond to more different kinds?