I recently purchased the Yushu bottoms. This purchase also included the Yushu top. My reason for purchasing was that I wanted a warm and proven wool base layer for a multi-species solo hunting adventure into the Wyoming (USA) backcountry from middle to late October 2022. These did not disappoint. I am 5'11" tall, 32" waist, and weigh in at a lean 184# . On me, size medium was not quite an athletic fit but yet not quire a relaxed fit. I would say more athletic in fit but not skin tight like, say, Under Armor Cold Gear. They were warm and their breathability was evident when hiking up 2000 feet in elevation under load. When I first put them on, I detected an ever-so-slight scratchy sensation. However, after a few minutes of wearing them, that disappeared. The Yushu bottoms (and tops) are an excellent choice, among the many wool brands available, for a base layer in cold weather conditions.