Ben Rad wrote a review of Millet Pierra Ment Alpha Pant - Men's on November 12, 2015
Familiarity: I've used it several times
Fit: Runs large
Only puffyish pants I could find on the market with the alpha insulation.
I have one these almost every day since getting them. I toured in them starting early and forgot the baselayer I wanted so decided to give these a shot with a cold morning I was feeling need for insulation. Yes once I started moving with the sun on me I got hot. Opened pants and puffy pants zips and then my legs were perfect if not cold. But I wasn't getting the cooling to the privates and they were sweating.
Super comfortable, fleece feeling on the inside due to the alpha allows an open inside.
I have a 29" inseam, 28" waist. Ordered small and nothing too big but was hoping and expecting a bit smaller since they will be under outer layer.
As far as durability not sure. I would be concerned with continous use as outer layer the knee is articulated with stitched at the joint that makes me think it is the weak spot that won't hold up or the stitching will wear out or stretch break.
I don't think there is a lot of these for sale in the united states so get them while you can. Great product stoked with my purchase!