After freezing my way through several trad sessions I decided it was time to upgrade in the thermal department.
To be honest, I only got these because they were the only thermal bottoms in stock in my size but I'm not disappointed.
The fabric is beautifully soft and comfortable and thus far durability has been good. Just adding these keeps the heat in like you wouldn't believe. I've been on climbing trips at around 6 degrees for 9 hours+ where you are basically stationary for 95% of the time and they make such a massive difference.
The only thing I'm skeptical of is the cut. They fit snuggly around my calves but are a little loose around the thighs, not so much so that it becomes a problem though. Maybe all that running is paying off...!