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The Alpha IS Jacket is a bombproof hardshell and an ultra-warm insulated jacket, all in one. It's designed for harsh, unforgiving conditions when alpine climbing or mountaineering. 
The Alpha IS Jacket is a bombproof hardshell and an ultra-warm insulated jacket, all in one. It's designed for harsh, unforgiving conditions when alpine climbing or mountaineering. 

Arcteryx Mens Alpha IS Jacket Black

£420.00  £700.00  40% off
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Arcteryx Mens Alpha IS Jacket Black Information

Season : Sale

Brand : Arcteryx

Code : 19627-BLA

What is the Alpha IS Jacket?

The Alpha IS Jacket is a bombproof climbing-orientated hardshell and an ultra-warm insulated jacket, all in one. Combining these two layers makes it 18% lighter than wearing similar layers separately and makes it perfect for harsh, unforgiving environments. 

What is it made of?

Insulation: Arc'teryx use their exclusive ThermaTek synthetic insulation throughout the Alpha IS. ThermaTek is a fully synthetic insulation designed to provide warmth in all conditions, even when soaking wet. The insulation itself is given a durable water repellent coating to increase its hydrophobic properties even further and is the fastest drying insulation in the Arc'teryx range. It's then laminated to a backing fabric to ensure the insulation is spread out evenly across the jacket, minimising the risk of a cold spot developing. If all of this wasn't enough, an extra layer of Coreloft Continuous 65 insulation has been added to the shoulders for additional warmth. 

Fabrics: Surrounding all of this versatile insulation is a 40D nylon coupled with a 2 layer Gore-Tex membrane. The tough 40D nylon acts as a suit of armour and protects the membrane (and you) from abrasion, while the Gore-Tex membrane provides total waterproof and windproof protection. The outer fabric, like the insulation, is also given a durable water repellent coating as another layer of defence. 

What are its features?

Starting at the top, the Alpha IS features Arc'teryx's StormHood which will comfortably fit a climbing helmet underneath, adding valuable warmth when stationary. To adjust the hood, there are Cohaesive adjusters built into the fabric itself. These are a little like buttons beneath the fabric that are super easy to use when wearing bulky gloves or mittens and eliminates the risk of long pieces of elastic slapping you in the face. When the hood isn't being used, there is still a tall collar with a soft lining for superior protection. Moving down, the main zip has braking bumps installed to prevent it coming undone during use. Cleverly, there are also Coheasive adjusters in the hem which serve two purposes; one is to seal in warmth, the other is to lock under a climbing harness to prevent the jacket rising up during use. 

Pockets wise, you've got an internal zipped chest pocket, an internal dump pocket and two insulated zipped hand pockets. All zips are highly water-resistant (not waterproof), but we'd still recommend keeping valuables on one of the inner pockets. Lastly, an included stuffsack packs the jacket down for compact transportation. 

How does it fit?

It features a regular fit overall with a longer length for greater protection. For reference, the centre back length is 78cm in a size medium. Arc'teryx's articulated patterning and gusseted underarms ensures you never feel restricted when climbing.

Where does it fit in the layering system?

The Alpha IS has been designed solely as an outer layer to provide unbeatable protection and warmth in cold, wet conditions. It works best when you're moving constantly and will fit over additional layers (provided you get the right size!) without much restriction if you need even more warmth. 

  • Internal chest pocket with zip
  • Internal dump pocket
  • Two insulated hand pockets with zippers
  • Adjustable hem drawcord
  • Drop back hem
  • Cohaesive hem adjusters function as Hemlock to prevent jacket from slipping out from under a climbing harness
  • Includes stuff sack
  • DWR (Durable Water Repellent) finish repels moisture
  • WaterTight external zippers
  • Full length Vislon No Slip Zip front zipper
  • Tall collar
  • Soft, smooth lined collar
  • Helmet compatible StormHood
  • Cohaesive hood adjustments for ease of use with mittens or gloves
  • e3D Ergonomic 3-Dimensional patterning for enhanced comfort and mobility
  • Gusseted underarms for mobility and comfort
  • Taped seams
  • Highly hydrophobic DWR treated ThermaTek synthetic insulation
  • Additional layer of Coreloft Continuous 65 insulation for additional warmth

Care and maintenance

To keep your outdoor clothing and equipment in tip top condition and performing to its maximum we recommend the use of Nikwax products. We have been using Nikwax products since day one (26th March 1986) and have found them to be totally reliable, dependable and effective. Today’s Nikwax treatments contain environmentally friendly elastic water-repellent polymers that bond to fabric fibres, leaving the spaces between open and breathable. These stretchy polymers are able to stretch and move with the fabric so they stay put for longer and work better.

Nikwax treatments will not change the look or feel of the fabric and they are all water based, environmentally safe, non-flammable and contain no nasty Fluorocarbons. Nikwax products can be used to clean, re-proof and revitalise all your outdoor technical clothing and equipment.

Waterproof breathable clothing has a durable water-repellent (DWR) finish applied to the face fabric during the manufacturing process. The DWR forces water to bead up and roll off the surface therefore preventing the fabric from absorbing moisture. If the outside of your jacket is soaked in a layer of cold water, the warm damp air within can’t escape and will condense on the inside. This makes the jacket feel cold clammy and can make you think that it’s leaking. The DWR finish is not permanent and needs to be maintained and revitalised to optimise performance.

This three layer waterproof jacket should be cleaned regularly with Nikwax Tech Wash; I wash my jacket about once a month, or more often if it gets really filthy. Regular washing with Tech Wash will maintain the DWR for longer and remove salts and oils that can contaminate the fabric, and it will keep your lovely jacket clean and smelling fresh. Washing can be done in a machine according to the manufacturers care guidelines (on the internal label). First clean out any detergent and conditioner residue from the machine dispenser and then add the required amount of Tech Wash and away you go. Hand washing is also suitable but be sure to rinse the garment well.

When you notice that rain/water is no longer beading up and rolling off it’s time to re-proof. Nikwax TX Direct will re-instate a long lasting DWR to completely rejuvenate your jacket. Re-proofing can also be done in the machine once a garment has been washed. Just add the TX-Direct and use the same programme you used for washing. You can also use the spray-on product on a damp garment that has just been washed.

You wouldn’t buy a Ferrari and never have it serviced, so make sure you regularly wash and re-proof your quality kit.

Technical Information

Weight: 610g

Insulation: ThermaTek DWR treated synthetic insulation / Coreloft Continuous 65 (65g/m²) insulation

Fabrics: N40p-X 2L GORE-TEX

Centre back length: 78cm

Sizing Information

Arc'teryx Men's Jackets & Shirts Sizing Information

Measurements refer to body size, not garment dimensions.


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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