Peterjohnwrote a review of Arc'teryx Sidewinder SV Jacket - Men's on March 7, 2016
Familiarity: I've put it through the wringer
Fit: True to size
I've got about 35 hours mountain time on this jacket so far in weather conditions ranging from mid teens with strong wind and snow to low 30's with sunshine. Its super light, overall comfortable, and leaves you with plenty of ability to move any which way you like without feeling the jacket twist or become tight. All the features you'd expect to keep you dry and wind proof perform fantastically.
The Sidewinder zipper feature is probably my least fav part. of the jacket. I ride goofy which puts the zipper in the center of my beard when I'm riding and also has the components of the zipper chaffing my face whenever I turn my head (which gets old fast when the ice cold wind is howling and your skin is drying out). The Sidewinder feature also makes the zipper impossible to pull all the way with a single hand. In all the years I've been wearing shells on the mountain, I'd never in a million years thought a zipper could have so many functional issues.
I ride Burton AK Hover pants which don't work with the attachments on the powder skirt but as long as I remembered to pull the skirt down on a regular basis (it rides up whenever sitting down) I kept the snow out of my pants and back.