brigid T.wrote a review of Arc'teryx Cerium SV Hooded Down Jacket - Women's on January 8, 2017
Familiarity: I've used it several times
Fit: True to size
Got this for really cold days at altitude for an upcoming climb to Kilimanjaro. I have had the chance to test it multiple times in single digit to subzero temperatures in Chicago even before leaving and it is truly a warm jacket. It is very easy to stuff into the stuff sac, which is conveniently sewn into the interior pocket (great for people like me who *always* lose those!). I will say I normally wear a S due to my shoulders and bust being on the small side but I sized up to a M to make sure that the hips fit and am glad I did. If you are more 'pear' shaped like me, definitely use the hip measurement as your guide. There is not give there and honestly don't want it to ride up and let the cold air in. It has room to give them in the chest but this is fine as it leave plenty of room for layers at camp.
I will also say that wearing it on a 25*F day to walk 10 mi even with only one layer on underneath made me way too warm. So if you are looking for something for those really cold days - this is your jacket. If you are looking for something to do vigorous exercise around 20-30*, you should pick something lighter weight.