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Warm, incredibly lightweight, highly weather resistant and supremely packable, the Nuclei is ideal for alpine climbing, belaying and Scottish winter mountaineering. 
Warm, incredibly lightweight, highly weather resistant and supremely packable, the Nuclei is ideal for alpine climbing, belaying and Scottish winter mountaineering. 

Arcteryx Mens Nuclei FL Jacket Cinder

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Arcteryx Mens Nuclei FL Jacket Cinder Information

Season : Sale

Brand : Arcteryx

Code : 25170-CIN-

What is the Nuclei FL?

Featuring a windproof, highly water resistant outer fabric and Arc'teryx's own Coreloft synthetic insulation, the Nuclei is warm, incredibly lightweight, tough and packable. It's the ideal piece for alpine climbing, belaying, Scottish winter mountaineering and as a warm jacket to stick over your other layers when stationary. 

What is it made of?

Insulation: Arc'teryx use their own Coreloft Continuous 65 synthetic insulation inside the Nuclei. Thanks to its synthetic construction, Coreloft is virtually unaffected by moisture, packs down to a fraction of its original size and provides high amounts of warmth when using it as a stop-start piece in the UK or as a super warm active piece in alpine conditions. 

Outer fabric: Surrounding this toasty insulation is a tough, windproof and highly weather resistant 10D nylon fabric. Although 10D may convince you that this is as tough as tissue paper, it's woven in a ripstop construction to increase the durability far beyond that of a non-ripstop fabric. Its windproof construction boosts the overall warmth of the jacket tenfold, making it the perfect choice for super cold, windy, harsh conditions. A durable water repellent coating is then added to the outer of this fabric to allow light rain and snow to bead off the surface. 

What are the features?

Starting at the top, a fully adjustable, helmet-compatible StormHood adds valuable warmth and protection on cold belay stops and alpine ascents. Two external hand pockets store essentials, while two internal dump pockets are perfect for a warm set of mitts or gloves. An adjustable hem seals in warmth around your waist and can be adjusted easily when wearing a harness. 

How does it fit?

The Nuclei features a trim, regular length (67cm, size medium) and is designed to be worn fairly close to maximise warmth. If you're familiar with the Atom by Arc'teryx, the Nuclei is a little slimmer.  

Where does it fit in the layering system?

The Nuclei is primarily designed to be worn as an outer layer, either when stationary to provide warmth and protection or while climbing/mountaineering in cold, harsh conditions. 

  • Windproof
  • Highly water resistant
  • Tough ripstop nylon outer fabric
  • Coreloft insulation
  • Two internal dump pockets
  • Two external hand pockets
  • Adjustable hem
  • Helmet-compatible hood
  • Trim fit

How Should Your Insulated Jacket Fit?

Insulated jackets are pedantic little things. Too tight and you'll compress the insulation and limit the warmth capabilities of your brand new jacket, too loose and you'll spend hours warming up the dead space inside the jacket. Getting the correct fit isn't just about aesthetics, it will determine how warm you are. 

The Incorrect Fit

Too loose: A jacket which is too loose will keep you relatively warm, however it will take far longer to do so and will waste large amounts of your precious energy. An insulated jacket works by trapping the natural heat that your body gives off in the fibres of the insulation; this creates a micro-climate inside your jacket, keeping you warm and toasty. If your jacket is too loose, heat will be able to escape through the hem, the sleeves and the neck of the jacket; it's a little like sticking the heating on in your car with the windows cracked open - it will heat up, just incredibly slowly.   

Too tight: A jacket which is too tight is arguably worse than one that is too loose. If your jacket is far too tight, the baffles can compress to a point where the insulation can't loft effectively, limiting the amount of warmth it can trap. Essentially, it won't work! 

The Correct Fit
It's a tricky one to explain, but it's somewhere in the middle. You've first got to consider how many layers you'll tend to wear underneath; will you have just a t-shirt then the jacket, or possibly a baselayer, midlayer and then the jacket? When you've figured out your layers and you've popped your insulated jacket over the top, you shouldn't have any dead space inside. The cuffs and hem should be comfortably sealed around your waist and wrists with room to move. You should be able to lift an arm up above your head without the hem of the jacket lifting more than an inch or so, and the sleeves should be long enough that when carrying out the same motion, they aren't mid-way up your forearm. Your shoulders and chest area should have enough room so that your hands can touch behind your back without feeling restricted. 

Additional Information
Lastly, consider which activites you'll primarily be carrying out while wearing the jacket. Are you primarily using it as a winter climbing piece, or an everyday/dog walking jacket? You'll find that technical climbing jackets tend to feature a shorter cut, while urban and casual jackets feature a longer cut to offer additional warmth with less mobility.

To see examples of what a badly fitting and correctly fitting jacket looks like, click here.

Technical Information

Weight: 325g (M)


- Arato 10r, 100% nylon

- Coreloft Continuous 65

Sizing Information

Arc'teryx Men's Jackets & Shirts Sizing Information

Measurements refer to body size, not garment dimensions.

  Chest Waist Hip Sleeve
X-Small 36" 29" 36" 32"
Small 38" 31" 38" 33"
Medium 40" 33" 40" 34"
Large 43" 36" 43" 35"
X-Large 46" 39" 46" 36"
XX-Large 50" 43" 50" 37"
  Chest Waist Hip Sleeve
X-Small 92cm 74cm 92cm 81cm
Small 97cm 79cm 97cm 84cm
Medium 102cm 84cm 102cm 86cm
Large 110cm 94cm 110cm 89cm
X-Large 118cm 99cm 118cm 91cm
XX-Large 128cm 110cm 128cm 94cm

Next to Skin Fit: Cut snug to the body through the entire garment to enhance moisture management and thermal efficiency.

Slim Fit: Cut slim to the body through chest, waist, hip and thigh for a low profile fit.

Regular Fit: Cut comfortably from the body through bust/chest, waist, hip and thigh for a classic fit.

Relaxed Fit: Cut loosely through the waist, hip, and thigh for a casual fit.


Measure around your chest/bust, holding the measuring tape under your armpit.


Measure around your waist at the narrowest part.


From a standing position, measure from your crotch to your ankle.


With your arms in a slightly bent position, measure from the centre of the back of your neck, along the length of your arm, to the wrist.


Measure around your hips at the widest part.

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