For medium to long distances, it's essential to wear compression socks to reduce the strain when climbing stairs.

Recently, mountain races have become more frequent. For medium to long distances, compression socks are indispensable to reduce fatigue from climbing and accelerate post-race recovery.
I started wearing the Taiwanese brand @flipposhk a few years ago. I love their ethnic styles and the variety of Earth tone colors, which aren't as overtly sporty as other brands, making them great to pair with long pants for going out.
I wore them for a nearly 20km run in 30-degree Celsius heat this past weekend. Overall, they felt breathable and quick-drying, absorbing sweat slightly, with a texture similar to cotton. They also have silver fiber for odor and bacterial resistance. I expect to have less chance of matching outfits with others in future races.

Wearing The Voice Cidal Sun & Red Leaf
Hong Kong — @mountfellas