James M.wrote a review of Arc'teryx Beta SV Jacket - Men's on October 5, 2018
Familiarity: I've used it several times
Fit: Runs large
First off, this jacket runs big. I have a lot of Arc'teryx jackets, and usually wear large for an outer layer (and medium for a layering jacket). I am 5'11" and about 185-195 lbs depending on the time of year. The medium fits similar to a large Gamma MX through the length and arms, but has more room to layer. I purchased this in Medium and there is plenty of room to layer without being too bulky (I usually wear three layers when I ski: 1) a thin fleece shirt (think capilene air), a long sleeve fleece shirt and potentially a mid weight fleece (I don't get cold and would rather stay cool than hot). I also wear bibs. After one season of wear, I prefer to wear my Mountain Hardwear Neo Shell with powder skirt on most days except ultra cold windy days. The Neo breathes so much better. On super cold and wet days, the Beta SV is a much better choice. It keeps out the wind chill. One spring/warm days I prefer the Neoshell or my Gamma MX. This Beta SV is definitely a severe weather jacket designed for cold weather. And for that purpose, it does it's job well.
It is a super well built jacket, and still looks new. I wear bibs too, so the lack of a powder skirt is less of an issue for me, but I would not want to ski in power in this jacket with regular pants. If that is your intent, I'd recommend sizing up to get a bit more coverage.