Is it really necessary to buy a coat in these situations of ordinary mountaineering travel?

Of course it is necessary. First of all, the jacket is the symbol of hikers, and the face of outdoor travel is very important. Secondly, there is no doubt that the fabric in the north is breathable, and the wolf claws are not much different. The permeability is very high, so people who work in high mountains don't have to worry. There is also the coat is not worn every time, mainly because of the rain and so on. And I don't wear it when I'm free.