I purchased this jacket specifically for hiking Highland Bowl (a 30-45 minute, 850ft gain, mile-long hike at 11-12k feet) since dressing for the Bowl is tough. It can be blowing 50 mph and you are concerned about frostbite, yet are sweating. Then you need to be warm on the ski down. I'd heard that Polartec Alpha was the answer, a "leave it on" kind of insulation, and it turned out to be true. This stuff is warm, so on the long chairlift ride up the mountain, to the base of the bowl, I wasn't freezing with just a base layer, and this jacket as the mid-layer, with a shell on top.
At the base of the hike, if it's not too cold and windy, I've been stripping off the shell and letting the air permeable face fabric of the Pierra Meant Jkt do its thing and suck out moisture from the Alpha insulation. Long story short, even when I'm hiking my a*s off for Skimo Training, this thing stays dry. Any wetness on my back from wearing a backpack is evaporated by the time I put my skis on at the summit.
And amazingly enough, it's simply a warm mid-layer if I'm just riding lifts. I use a shell over it in those cases, and it feels lightweight and warm.
Huge fan. Polartec is crushing with Alpha here, and Millet finishes it nicely with an air-permeable face fabric from Pertex, a leader in ripstop, lightweight, breathable fabrics. Love the extra details like the windproof light hood, reflective details for early-morning or evening skin sessions, the huge mesh pocket on the interior, and the hem draw cord.
If you like the uphill as much as the down, get some Alpha.
If you want a jacket from a brand that knows their sh*t about Skimo, buy Millet. Just size up from your normal US size. I wear an XL and am 6'2" 175lbs. I am a size L in most US brands. But the XL from Millet fits great.