Arcteryx Men's Alpha SL Pant

Arcteryx Men's Alpha SL Pant

Arcteryx Men's Alpha SL Pant is rated 4.9 out of 5 by 13.
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4.8 Star Rating

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Product Description Item No.   10266883

The Arc'Teryx Men's Alpha SL Pant is a waterproof pant for hiking and climbing. When the trail and mountains are in front of you, there isn't always time to wait for perfect weather. These pants will shed wind, rain, and all other weather you'll come across, thanks to N40r GORE-TEX® with Paclite® technology. Yes, Paclite®. They're incredibly lightweight, so when the weather is cooperating with your adventure, they can be quickly stuffed into the mesh front on your pack. Reinforced with N150p-X GORE-TEX® with Paclite® at high abrasion areas, you're ready to take on it all. Full length zippers for easy on/off and a reinforced instep patch to protect against boots, and other sharp edges ensure they're a staple in your kit for years.

FEATURES of the Arcteryx Men's Alpha SL Pant

  • N40R face fabric laminated to Gore-Tex fabric with Paclite product technology delivers ultralight, packable weather protection
  • N150P-X face fabric laminated to Gore-Tex fabric with Paclite technology reinforcements in high wear areas
  • Full length side zips for easy entry and rapid ventilation
  • Dual low profile waist adjusters fit under harness or pack waist belt
  • Trim leg fit reduces crampon snags
  • Reinforced instep patch for abrasion resistance
  • Hem cord adjustment and tuck away bootlace hook
  • Micro-seam allowance (1.6 mm) reduces bulk and weight
  • Pull-on style with elasticized waist

- + Product Specifications
Disclaimer: We only ship this brand to US Addresses.
Product Technology: GORE-TEX Paclite, GORE-TEX
Weight: 12.9 oz
Pant Rise: Mid
Features: Adjustable Waist, Packable, GORE-TEX
Gender: Mens
Best Use: Climbing, Ice and Mixed Climbing, Skiing, Snowsports, Winter Camping, Basecamp and Expedition, Mountaineering and Alpine, Snowboarding, Trekking, Snowshoeing, Rainwear, Hiking
GORE-TEX Paclite

GORE-TEX Paclite
GORE-TEX Paclite is the gold standard for lightweight, breathable elemental protection. Paclite jackets are extremely packable and great to have on hand for windy or rainy conditions. They'll keep your torso dry and comfortable.

GORE-TEX fabric technology

Garments made with GORE-TEX® fabric are durably waterproof, windproof and highly breathable, providing reliable weather protection and maximum comfort for a wide range of activities. These garments keep your body dry by allowing perspiration vapor to escape so you remain cool during activity and warm during cool-down.

Check Out All GORE-TEX® Products >

Rated 5 out of 5 by from Does what it says on the tin I've been using these trousers for a while now. They are extremely light but this does not compromise their waterproof or windproof properties. They pack away to next-to-nothing in your sack and you could almost forget you owned them until the rain comes. These are minimalist kit, so don't expect full length zips and a fly - you unzip the lower zips and pull them on. It might take a sexy wiggle or two before they come up to waist level - but when they do they are perfectly comfortable. They are light, comfortable and breathable enough to wear in their own right all day (over longjohns) if the weather turns wet, but also suitable to rush on for a brief shower.
Date published: 2012-02-02
Rated 5 out of 5 by from Perfect pack along rain pants I spend alot of time hiking in the western Washington cascades and for those who don't know it gets wet. During the rainy months here, from march to June, this is the pair of pants I start every hike in. I wear nothing but my shorts underneath. These pants have no insulation but none needed during these months. Like all arcteryx products, great material, great construction, etc. No gators needed either, has clasp on end of pant legs that connects to your boot laces.
Date published: 2011-10-09
Rated 5 out of 5 by from These are the real deal! I spent quite a while looking for waterproof pants that are cut in a way that they are at the same time low volume and bulk without restricting movement. They are light and pack small enough to take on multipitches where they probably wont even be used. In the winter I use them for ice climbing when temps are close to 0 C. They are great to climb in, but the paclite gore of course doesn't stand a chance against tiny cuts from screws hanging from the harness. A size M long is perfect for me (182cm 74kg).
Date published: 2013-03-01
Rated 5 out of 5 by from Great lightweight hardshell pants I bought these a month ago for occasional use as rain/snow pants for hiking, backpacking, and snowshoeing. Right out of the box they feel solid, the Paclite fabric is thin but feels durable. While these may not hold up perfectly with daily use, they are light enough to always carry in a pack and the full side zips allow them to be put on over pants/boots. One note on sizing is that the listed dimension for the size is the maximum that the pants will accommodate making a medium fit snug on a 33" waist.
Date published: 2016-01-04
Rated 5 out of 5 by from Bombproof, Durable, Excellent fit, keeps moisture out I'm living in Vancouver with probably the most dreary weather during the fall, winter and spring months. I always carry the Arcteryx alpha SL around with me just in case I forget my umbrella and get caught in a rainstorm. With these bottoms and an arcteryx rush jacket even under the most wet conditions I stay dry top to bottom. And I am honestly talking about torrential downpour. I'm about 6 feet tall 180lbs and the medium fits almost perfectly with me wearing a layer underneath (they are stretchy enough to fit over jeans or a normal baselayer) and bottoms fit around my boots perfectly without it being too tight/loose. (I also own the sabre pant which fits exceptionally large at the bottom) When I go for runs and really start building up sweat, these aren't exactly the most breathable fabric considering they are goretex, but in a very short period of time the moisture goes away, unlike normal sweat pants or jeans that basically just stay wet. Overall I'm extremely happy with this product and I'd even recommend it for skiing/snowboarding!
Date published: 2014-11-23
Rated 5 out of 5 by from Great ultralight pant I think these are some of the lightest full zip pants on the market, if not the lightest (note: if Arcteryx can make them even lighter, that would be even better!). The waist hook system works really well: I was able to put these pants over other layers in super windy conditions, something that's usually not easy. I appreciate reinforcements in high wear areas. Great pants, recommend w/o any reservations.
Date published: 2015-03-20
Rated 5 out of 5 by from Great summer rain pants It is my great summer rain pants. It is so comfy that i forget it's there. I wore it in downpour, typhoon with signal no.8......, and it is bomdproof. I wear a S size alpha SL . The full length zippers are great. Zipping off a little bit, I can reach pocket of rampart short underneath to take wallet to pay the bill. It also packs small once the black cloud gone. Good product.
Date published: 2013-12-03
Rated 4 out of 5 by from Colors are not appearing accurate on the site. While I appreciate the design and thought applied to your products it is a big disappointment to see the images online given they are rarely color accurate. Given the thought that went into the colors I’d appreciate it if more effort was placed on producing color accurate images. There is way too much contrast and like the color of this "cayenne" color pant it looks neon orange rather than cayenne like on the pant cuff closure detail and the watertight zipper detail. I believe those are pretty close to the real thing. This is only an example I could find many of these color inaccurate cases on the site. Your image guy does nice work making the site look cool with lots of interesting photos and using images with lots of contrast but I am sure all your customers would appreciate it if your products were their normal colors, I don't have too many places I can go to try this stuff on and see in person. Given your products are some of the industry's best I think putting some emphasis on the presentation of those products would be in everyone’s best interests.
Date published: 2013-04-02
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- + Size Guide

Men's Jackets, Shirts and Tops
SIZE X-Small Small Medium Large X-Large XX-Large
Chest 36" 38" 40" 43" 46" 50"
Waist 29" 31" 33" 36" 39" 43"
Hip 36" 38" 40" 43" 46" 50"
Sleeve Length 32" 33" 34" 35" 36" 37"
Numeric Size 36 38 40 43 46 50

• Arc'teryx recommends you calculate your body measurements using the info in the Measurement Guide below before selecting a product size. The measurements provided in their size guides refer to your body measurements unless otherwise specified.

• Check the fit type in the product FEATURES and SPECIFICATIONS and refer to the Fit Guide below to ensure you are ordering a product for the correct end use.

Men's Pants
SIZE X-Small Small Medium Large X-Large XX-Large
Waist 29" 31" 33" 36" 39" 43"
Hip 36" 38" 40" 43" 46" 50"
Length (Short) Subtract 2"
Length (Regular) 30 1/2" 31 1/8" 32 3/8"
Length (Long / Tall) Add 3"

• Please note that the actual pant length may vary slightly from the info above, depending on the intended end use of the product.

Men's Numeric Pant Sizing
SIZE 28 30 32 34 36 38
Waist 28" 30" 32" 34" 36" 38"
Hip 35" 37" 39" 41" 43" 45"
Inseam 32" 33" 34" 35"

• Several models of Arc'teryx pants are sized numerically and available in different inseam lengths. You will see these sizes reflected in the options in the Select a Size drop down menu for particular products.

• For all other pants available in numerical waist sizes where the inseam length is not specified, the inseam lengths provided above apply.

SIZE Small / Medium Large / X-Large
Head Circumference 21.7 - 22.4" 22.8 - 23.6"
Men's Gloves
SIZE X-Small Small Medium Large X-Large
Hand Width 7.6 - 7.9" 7.9 - 8.2" 8.2 - 8.6" 8.6 - 8.9" 8.9 - 9.3"
Hand Length 7 - 7.2" 7.2 - 7.5" 7.5 - 7.7" 7.7 - 8" 8 - 8.2"
Unisex Gloves
SIZE X-Small Small Medium Large X-Large
Hand Width 7.3 - 7.6" 7.8 - 8.1" 8.2 - 8.6" 8.6 - 8.9" 8.9 - 9.3"
Hand Length 7 - 7.2" 7.2 - 7.5" 7.5 - 7.7" 7.7 - 8" 8 - 8.2"


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

Waist - Measure around the natural waist, which is often the narrowest part of your waist.

Hip - Measure around your hips at the widest part.

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

Inseam / Pant Length - From a standing position, measure from your crotch to your ankle.

Head Circumference - Measure the full circumference around the widest part of your head.

Hand Length - Measure from the tip of your middle finger to the base of the palm.

Hand Width - Measure the circumference of your hand around the knuckles, excluding the thumb.

• Please note that all the info provided above refers to body measurements, and NOT the dimensions of the garment.


Next to Skin Fit - These snugly-fitting garments are made with stretch fabrics to fit next to the skin to enhance moisture management and thermal efficiency. Garments in this fit category when constructed using Arc'teryx's heavier-weight AR and SV fabrics also perform very well as mid layer pieces, and users should consider selecting a larger size to accommodate a base layer underneath if the intention is to use this layering system as a mid layer option.

Trim Fit - Trim-fitted garments share the motion-friendly traits with Arc'teryx "Athletic" fit garments, but are patterned with lower volume for reduced bulk. These close-fitting pieces layer well under other garments.

Athletic Fit - This is the "Arc'teryx Standard" fit. These complete patterns utilize anatomical shaping and gussets to enhance motion by minimizing excess bulk. Easy layering under or over each item extends seasonal versatility and comfort.

Relaxed Fit - Relaxed fit garments rely on higher volume patterns and a reduced amount of articulation to offer roomy mobility.

Expedition Fit - Cut roomier than the Arc'teryx Athletic fit and suitable for winter/extreme conditions, Expedition (XPD) fit garments are cut larger to accommodate multiple layers without binding or restricting movement.

• You can find the fit type and additional fit info for Arc'teryx styles in the product description FEATURES and SPECIFICATIONS.

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