Keep the warmth in and the wind out, while your wait.

February 20, 2020

Back by popular demand after a threeyear hiatus, the Nuclei FL Jacket returns to provide warmth. Made with best in class materials to deliver the greatest possible warmth-to-weight ratio that synthetic insulation has to offer.


• Arato™ 10r is a 10D windproof nylon ripstop with enhanced thermal efficiency

• Coreloft™ Continuous 65 synthetic insulation provides warmth and remains packable

• Adjustable harness compatible hem seals out cold



With durability in mind, the Nuclei FL utilizes Arato™ 10r, a new ripstop face fabric designed to keep the wind out and retain warmth for rest periods in alpine conditions. Together, with Coreloft™ Continuous 65 synthetic insulation, the Nuclei FL retains loft to create a lightweight piece ideal for protecting climbers during belays, but still strong enough to hold up against harness wear and tear. “In my entire time at Arc’teryx, I’ve never heard so much outcry for a product to return. We were able to find the perfect balance between durable and lightweight to bring back a stronger Nuclei FL, with more attention to detail and at a reduced weight.” - Brylee Geddis, Product Designer


Packable and lightweight, the Nuclei FL can be easily tucked away or clipped to a harness. The adjustable, helmet compatible StormHood™ adds warmth and protection for changing alpine conditions. The woman’s Nuclei FL was designed by a woman, the men’s by a man, and the two designers came together to refine the features and construction for a considered and comfortable fit. Hood and cuff refinements, articulation and gender specific performance details are all built in. Long trusted by athletes and professionals, the newly updated design has been informed by the feedback of some of our most active product users.



Arato™ 10r - 100% nylon

Coreloft™ Continuous 65

(65g/mÇ) insulation

Date Available:

January 10, 2020



Men’s– 325g/11.5oz (M)

Women’s– 285g/10.1oz (S)













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