Trim fitting, compact, lightweight Coreloft™ synthetic insulated belay jacket with a high warmth to weight ratio, women's specific design, and a light, strong, compressible Arato™ nylon shell.
DESCRIPTION
With light and compact warmth as the goal, Arc'teryx combined the lightweight performance of Coreloft™ synthetic insulation, an ultralight Arato™ nylon shell and highly efficient ergonomic patterning to create an alpinist's hooded belay jacket that packs to the size of a water bottle and delivers effective warmth for just 220 grams. Articulated patterning and gusseted underarms provide extended mobility without sacrificing coverage. The fit is women's specific to optimize performance and comfort, and the Arc'teryx Trim fit with e3D fit accommodates layers, but stays close to the body for a higher level of thermal efficiency with minimal bulk. Arc'teryx e3D (ergonomic 3-Dimensional) patterning utilizes extra space in key joint areas to bring an added level of use specific articulation.
OPTIMIZING INSULATION

Purpose driven design means using materials that perform, and employing them in the best ways possible. In the Nuclei FL's case, utilizing different volumes of Coreloft™ insulation helped Arc'teryx reduce weight and bulk without sacrificing effective warmth. Mapping the insulation to place specific weights where they deliver the most appropriate benefit, they placed loftier 80g Coreloft™ in the body where a higher level of warmth is needed and bulk is less of an issue. Lighter, more compact 60g Coreloft™ insulates the sleeves and side panels to aid air permeability, streamline fit and improve mobility.
STREAMLINED FEATURES

Disciplined in its design, the Nuclei FL is as streamlined as possible. Simple elastic binding around the cuffs and hood is light, smooth and creates a secure fit. Hand pockets have streamlined, invisible zippers that stay out of the way of rope and rock. The Nuclei's internal pocket includes a removable stuff sack with a carabiner clip loop that allows it to be easily fastened to a harness or pack. The Arc'teryx No Slip Zip™ secures the closure with a series of small bumps spaced every twelfth tooth to secure the slider and prevent self opening but still unzips with a single hand for rapid ventilation.
FULL FEATURE LIST
Technical Features
Packs up small for easy travel storage
Breathable
Great warmth-to-weight ratio
Lightweight
Low profile
Compressible and packable
Construction
Micro-seam allowance (1.6 mm) reduces bulk and weight
Arc'teryx Nu water repellent treatment
Patterning
Articulated patterning for unrestricted mobility
e3D Ergonomic 3-Dimensional patterning for enhanced comfort and mobility
Female-specific styling
Gusseted underarms
Trim fit for base layer or light mid-layer use
Hood Configuration
Insulated hood
Helmet compatible
Zippers & Fly Configuration
Full front zip with chin guard and wind flap
No Slip Zip™ front zipper
Hem Configuration
Adjustable hem drawcord
Pocket Configuration
Two hand pockets with hidden zippers
Included mini stuff sack with drawcord closure
Integrated Features
Stuff sack can be clipped to a harness
MATERIALS
Coreloft™ 80 (80 g/m²) insulation. Made with highly crimped multi-denier siliconized polyester yarn, this lightweight, breathable, and thermally efficient, 100% polyester staple fibre is very compressible and has excellent loft retention.
Coreloft™ 60 (60 g/m²) insulation. Made with highly crimped multi-denier siliconized polyester yarn, this lightweight, breathable, and thermally efficient, 100% polyester staple fibre is very compressible and has excellent loft retention.
Arato™ 10 - 100% nylon
CARE
Machine wash in warm water (30°C).
Double rinse.
Do not use fabric softener.
Tumble dry on medium heat.
Do not iron.
AWARDS
Desnivel Gear Award Silver Winners - Midlayer Insulation
Klettern Magazine Recommended (Germany)