Excellent condition. Synthetic insulation. Gore Windstopper. Stuff sack included. Size Med. Bought it for an ice climbing belay jacket but its not getting the use it deserves. Time to pass it on. 

Retail $425. Asking $365 shipped or Denver/Boulder pickup.

This is a discontinued model.  Here is a comprehensive review.

https://www.thealpinestart.com/2016/04/22/review-arcteryx-nuclei-ar-jacket/