Keeps me warm in alaska's cold winters - Mountain Equipment Lightline Jacket - Women's

I live in Interior Alaska where the temperatures are COLD! Last January, daytime temperatures casually remained around -20F for the entire month. I needed a jacket that would be warm enough to get outside in (shoveling, using the outhouse, walks, hikes) but wasn't as big and bulky as those mushing parkas rated for -60F. This jacket is everything I had hoped for! I've now spent two frigid winters in it and am so happy with my choice.

Some temperature examples:
-I just came in from sitting in the outhouse. It's -9F right now. This jacket+base layer+sweater and I was warm and comfortable.
-Last winter, I would go on lunchtime walks at -20F. This jacket+base layer+sweater+down vest+ snow pants and I was comfortable for my 45 minute walk.
-Cross country skiing at -20F I would sweat in this jacket!
-I switch to another jacket when it gets above about 20F. It's so warm!

For size, I am 5' 8'' and 135 lbs. I wear a size 12/M and it's perfect to be able to add layers if I want.