Help: What kind of pants are better to wear while riding the Sichuan-Tibet Southern Line in September?

I don’t think it’s necessary to wear quick-drying pants. Commonly used pants will suffice. Add a pair of long johns, as it will be cold on the road (especially in the mountains), and the possibility of rain does not rule out, so Be sure to protect yourself from rain and buy a good raincoat. If you are doing laundry, you can find a place to rest for a day. The sun is good in Tibetan areas, so as long as it doesn’t rain, you don’t have to worry about it getting dry. Or bring or borrow a hair dryer, which is also very useful, especially for drying shoes or something.