Caroline Kellywrote a review of Patagonia Nano-Air Jacket - Women's on February 2, 2017
Familiarity: I've used it several times
Fit: Runs small
Wicked warm and lightweight.
Usually would buy a small but purchased a medium to put layers on under and to not feel super constricted, the small fit but was a little snug.
Only issue I've had was it got a small tear on the arm from a thorn. So partially my fault but I feel thats typically what happens over time with flexible and lightweight gear, but its an easy fix to patch up.
Overall awesome midlayer or everyday jacket.