Here's a practical example:
A toboggan run ended with me having one go about small stone boulders and the pants took out absolutely harmless.
There were registered no chafing or physical damage.
A friend, wearing a pair of jeans, had the same "lucky". However, here showed a grinding track and
Parts of the tissue were torn.
My pants were not different than before !!!
-> Absolute top!
Even in violent activities I was sweating not in his pants and on prolonged standing, in the cold, I was not cold.
-> It is not promised too much, but the description is totally satisfied !!!