Comfort is TOP NOTCH!
I haven't been able to put this to the test in the field yet due to a deployment, but i'd say a deployment is just as demanding on gear as field use. This is the perfect first layer. Never excessively warm. VERY comfortable. Thought the high collar with zipper would bother my neck but didn't even NOTICE. Don't expect to wear this alone as your warmth layer in freezing temps. I wear it day and night.