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Arc'teryx Alpha SL Anorak Review

Our favorite ultralight shell to leave in our packs for unexpected storms
arc'teryx alpha sl anorak hardshell jacket review
Credit: Arc'teryx
Top Pick Award
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Price:  $375 List
Pros:  Ultralight, less expensive, excellent packability, decent weather protection
Cons:  Limited feature set, questionable durability, high waist hemline, few venting possibilities
Manufacturer:   Arc'teryx
By Jack Cramer ⋅ Review Editor  ⋅  Jun 1, 2022
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70
OVERALL
SCORE


RANKED
#6 of 12
  • Weather Protection - 30% 6.0
  • Weight - 20% 10.0
  • Mobility and Fit - 20% 7.0
  • Venting and Breathability - 20% 6.0
  • Features and Design - 10% 6.0

Our Verdict

If you're looking for the best all-around hardshell, the Arc'teryx Alpha SL Anorak isn't it. But if you're looking for all-season weather protection in an incredibly lightweight package, the Alpha SL Anorak fits the bill. At just 7.8 ounces for a size large, this jacket weighs less than half as much as many other popular models. Its weather protection and durability are a little below average, but still adequate for a hardshell and vastly superior to similar jackets in its weight class. To enjoy the weight savings you need to be willing to accept further compromises in the form of limited venting possibilities and a disappointing fit. Still, these sacrifices could be worth it for serious human-powered adventures. We believe most shoppers will want a burlier hardshell for everyday use, but anyone seeking an extra hardshell for ultralight applications should be thoroughly pleased with the Alpha SL Anorak.

Compare to Similar Products

 
Awards Top Pick Award Editors' Choice Award    
Price $375 List$500 List$490 List
Check Price at Backcountry
$225 List
$219.38 at Amazon
$149.99 at Backcountry
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Pros Ultralight, less expensive, excellent packability, decent weather protectionLightweight, excellent fit for active uses, solid weather protection, plenty of pocketsAthletic fit, good packability, plenty of venting options, decent weather protectionGood ventilation, bargain price, lightweight, fully waterproofLightweight, inexpensive, easy to tighten drawcords
Cons Limited feature set, questionable durability, high waist hemline, few venting possibilitiesExpensive, DWR treatment wears off quickly, great all-round performance but not outstanding in any specific areasPricey, relatively heavy, limited durability, fabric seemed to get dirty quicklyInterior fabric is clingy, feels delicate, limited drawcordsGlossy internal fabric, poor mobility, hand pocket zippers not waterproof
Bottom Line Our favorite ultralight shell to leave in our packs for unexpected stormsA well-designed jacket that offers equally great weather protection, breathability, and mobility in a lightweight packageThis model is a slim-fitting hardshell that's designed for backcountry skiing and offers ample stretchAn ultralight waterproof model with underarm vents and and an exceptional price tagThis model is closer to a rain jacket than a hardshell, though it can be used as a lightweight just in case layer
Rating Categories Arc'teryx Alpha SL... Patagonia Ascensionist Ortovox 3L Ortler Marmot Knife Edge Mountain Hardwear E...
Weather Protection (30%)
6.0
8.0
8.0
6.0
6.0
Weight (20%)
10.0
7.0
5.0
8.0
8.0
Mobility and Fit (20%)
7.0
8.0
8.0
6.0
6.0
Venting and Breathability (20%)
6.0
8.0
8.0
7.0
5.0
Features and Design (10%)
6.0
6.0
7.0
6.0
6.0
Specs Arc'teryx Alpha SL... Patagonia Ascensionist Ortovox 3L Ortler Marmot Knife Edge Mountain Hardwear E...
Pit Zips No Yes Yes Yes No
Measured Weight (size large) 7.6 oz 13.6 oz 17.0 oz 12.4 oz 11.4 oz
Material 3-layer Gore-Tex with Hadron face fabric GORE-TEX Active with GORE C-KNIT, 30D recycled nylon Toray Dermizax NX Gore-Tex Paclite 2.5L 100% Polyester Gore-Tex Paclite 2.5L 100% nylon w/ DWR coating
Pockets 1 chest 2 zippered handwarmer, 1 zippered chest, 1 internal stretch 1 chest, 1 arm 2 hand, 1 chest 2 hand, 1 chest
Helmet Compatible Hood Yes Yes Yes Yes Yes
Hood Draw Cords 1 3 3 1 1
Adjustable Cuffs Yes Yes Yes Yes Yes
Two-Way Front Zipper No No Yes No No

Our Analysis and Test Results

For multiple years, the Arc'teryx Alpha FL was the top-rated jacket in this review. Recently that jacket has been removed from the Arc'teryx line up and we are unsure when or if that excellent product will return. The Arc'teryx Alpha SL Anorak may look similar, but it's a substantially more lightweight shell which is great for ultralight applications. However, don't expect the same outstanding all-around performance as with the old Alpha FL.

Performance Comparison


arc'teryx alpha sl anorak hardshell jacket review - rain wasn't in the forecast on this particular day but the alpha sl...
Rain wasn't in the forecast on this particular day but the Alpha SL Anorak is light enough that it was in this tester's pack.
Credit: Jack Cramer

Weather Protection


When it comes to weather protection, the Arc'teryx Alpha SL Anorak offers only modest performance. As an ultralight hardshell, it has an especially slim cut to maximize weight savings. Some of our testers were disappointed with the high waist hem and short arm sleeves because they seemed to ride up. This was particularly a problem while climbing because repeatedly raising arms overhead often caused this jacket to come untucked from a climbing harness. We would gladly accept an extra ounce of fabric for a lower waistline that would avoid this issue.


Despite some complaints about the waist and sleeves, we were impressed with the weather protection from the 3-layer Gore-Tex Hadron fabric. We were astounded that this ultralight material continued to bead water after months of testing while also resisting cuts and abrasion from sharp ice climbing gear and coarse rock. The main zipper on this pullover also proved to be completely waterproof and the simple hood fit well with or without a helmet on underneath.

arc'teryx alpha sl anorak hardshell jacket review - the alpha sl anorak is certainly acceptable for occasional ice...
The Alpha SL Anorak is certainly acceptable for occasional ice climbing but most shoppers will probably want a burlier hardshell for frequent winter use.
Credit: Jack Cramer

Weight


The most impressive aspect of the Arc'teryx Alpha SL Anorak is its astonishing low weight. At 7.6 ounces for a size large, it was easily the lightest hardshell jacket in this category. Although some other companies do sell jackets that are comparably ultralight, we have never come across another jacket in this weight class that offers close to the same level of weather protection or durability. In fact, we would classify all other sub-10 ounce models as rain jackets rather than proper hardshells. The Alpha SL Anorak is simply the lightest jacket that we believe is suitable for winter climbing.


To enjoy the weight savings, however, you do have to accept considerable compromises. We were happy to climb and ski occasionally in the Alpha SL Anorak but we wouldn't want to use it every day. The Alpha SL Anorak is a great choice for serious human-powered endeavors when ounces really matter but is less ideal for winter activities close to the trailhead. As such, we consider this to be a luxury piece of gear for niche ultralight applications. However, most people will also want a second hardshell more casual skiing or ice climbing days.

arc'teryx alpha sl anorak hardshell jacket review - the alpha sl packs down to an impressively small size...
The Alpha SL packs down to an impressively small size. Unfortunately, however, it doesn't come with a stuff sack or clip-in loop.
Credit: Jack Cramer

Mobility and Fit


We were somewhat disappointed with the fit and mobility of the Arc'teryx Alpha SL Anorak. The waist hemline felt high and the sleeves were a little short. The Gore-Tex Hadron fabric also is not as stretchy as the materials used on some other hardshells. As a result, we noticed the waist and sleeves riding up during dynamic movements.


When it comes to sizing, we found this jacket to be slightly smaller compared to other Arc'teryx jackets. Online customer reviews echoed this observation. If you're in between sizing we recommend sizing up (eg. if you're between a medium and a large, choose a large). However, if standard sizes usually fit, you will probably be most happy selecting the same size.

arc'teryx alpha sl anorak hardshell jacket review - one drawback to the ultralight design is a high waist hemline that's...
One drawback to the ultralight design is a high waist hemline that's prone to coming untucked from a climbing harness. Tester is 6'2" and wearing a size large.
Credit: Jack Cramer

Venting and Breathability


The ultralight aspect of the Alpha SL Anorak demands that it make some serious sacrifices. Many of the sacrifices come in the form of limited venting possibilities. Its pullover design significantly reduces your ability to vent heat out the main zipper. It also lacks pit zips for shedding heat during a prolonged cardio effort.


On the other hand, we were impressed with the breathability of the Gore-Tex Hadron fabric. This lightweight material seemed to breathe better than the thicker materials used on many other hardshells. Still, the breathability of waterproof fabric is rarely enough to avoid sweating out the inside of a jacket during sustained exertion. Due to this reality and the limited venting possibilities of this jacket, it's best to think of this model as something to take off during an uphill approach and then put on before you start the technical climbing or ski descent.

arc'teryx alpha sl anorak hardshell jacket review - breathability is most important when charging uphill, but to avoid...
Breathability is most important when charging uphill, but to avoid overheating it's usually a better call to vent your hardshell or take it off entirely.
Credit: Jack Cramer

Features and Design


This isn't a jacket you should buy for its feature set. Instead, it's a jacket you should buy for its simplicity and the weight savings that go along with that. In terms of features, the Alpha SL AnoraK has very few. It only includes a single pocket that's located on the left breast. This small zippered pocket is big enough to hold a phone but not much else. However, the absence of any hand pockets leaves the waist smooth which can reduce any points of irritation below a backpack hip belt or climbing harness.


Beyond the single pocket, the other features are sparse. The hood includes just a single drawcord and the chin does not incorporate any soft fabric swatches to reduce chafing. If you're forced to wear this jacket fully zipped with the hood up for a long period of time, expect to feel uncomfortable. The wrist closures utilize a simple velcro mechanism. We found this capable of keeping the cuffs reliably closed but the short length of the sleeves left them riding up occasionally.

arc'teryx alpha sl anorak hardshell jacket review - one feature we didn't like is a waist drawcord that's rather long...
One feature we didn't like is a waist drawcord that's rather long. We found it prone to snagging on branches or being accidentally clipped into carabiners.
Credit: Jack Cramer

Value


Anyone searching for a bargain on a hardshell to get them through the winter should probably consider another model. The Arc'teryx Alpha SL Anorak is simply too much of a specialty piece to meet the needs of most hardshell shoppers. Even though its price tag might be tempting compared to most other hardshells, it would be a poor choice for an everyday jacket. However, if you already own a sturdy hardshell and are looking for a second lightweight jacket to bring along for the biggest uphill days, then the Alpha SL Anorak is an excellent choice. Among specialty ultralight jackets, we consider it to be a solid value.

arc'teryx alpha sl anorak hardshell jacket review - we were really impressed with the durability of the hadron face...
We were really impressed with the durability of the Hadron face fabric. Despite being extremely lightweight, it withstood months of testing without getting a tear.
Credit: Jack Cramer

Conclusion


For winter days when the ounces really matter, the Arc'teryx Alpha SL Anorak is an excellent choice. At 7.8 ounces for a size large, it's the lightest jacket that we would be willing to classify as a hardshell. Although it can't supply the same weather protection or venting options as many heavier models, it's an ideal choice for ultralight endeavors. We think it's the best hardshell model to bring along as emergency protection when the forecast doesn't look stormy.

Jack Cramer
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