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Description

Bomber, weatherproof, trim-fit pant for alpine climbing or touring.

It may be sunny, but the weather can change on a dime, so equip yourself with the Arc'teryx Men's Alpha SL Gore-Tex Pant when you head out into the backcountry. The windproof, waterproof, and breathable Gore-Tex Paclite 2L membrane protects you from the wet elements and keeps this pant light so you can move fast. Full side zippers ditch excess heat and accommodate your climbing or touring boots.

  • Waterproof, windproof, and breathable Gore-Tex 2L Paclite membrane and fully taped seams shield you from snowy, wet elements while you tour or mountaineer
  • Reinforced seat and knee areas adds durability and longevity without adding extra weight
  • Trim cut provides a non-baggy, athletic fit
  • Full side zippers ditch excess heat while you tour or climb and accommodate your boots
  • Low-profile waist adjustment system offers a comfortable, just-right fit
  • Reinforced instep for added durability and longevity
  • Boot lace hooks and hem drawcords help keep the pant legs down and the snow out

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Arc'teryx Alpha SL Gore-Tex Pant - Men's

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5 5

Growing Room

  • Height: 6' 7"
    Weight: 245 lbs

XXL Longs will fit you if:

You are around 6 foot 8 - 10.
You have a waist size of at least 40 inches.
Your hips(buttocks) are extremely full
You don't mind having alot of puffery around your knees.

The pants are top quality and will be your go to pants if the above sounds like you.

My 6 foot 7 inch, 36 waist, 36 inseam was not enough to fit into the XXL longs... this time.

Responded on

sometimes Erin, a word describes a thousand pictures. Puffery, is one.... :)

4 5

good for bike commuting

  • Familiarity: I've put it through the wringer
  • Fit: Runs large
  • Height: 5' 10"
    Weight: 160 lbs
    Size Purchased: Small

After looking high and low for a pair of good, slim-fitting rain pants I could use for getting to work on my bike in the rain, I settled on these, without trying them on. Not bad for the occasional rain use.


The fit is a little strange, as other have pointed out. I'm about 5'10, 160lbs, usually wear a 32x30 pant size, and got the small. It fits snugly in the waist over my jeans, with a little stretch from the elastic in the waist. I'm actually really happy with how they fit in the waist, seat, and thighs. Very slim, not a lot of extra fabric or bagginess. The closure system for the waist works well, and is less goofy and more low-profile than having plastic buckles on the front, like some of Arcteryx's other pants.


From the knee down to the ankle though, they are pretty baggy. I'm used to wearing skinny jeans, and I knew they wouldn't fit that slim, but there's really a lot of extra material around the ankle that doesn't need to be there for any reason, except for those hikers that feel self-conscious wearing tighter clothing. Seriously, this is supposed to be Arcteryx's lightest, fastest, most trim-fitting pants, and there's probably an ounce of material they could get rid of here, and at the same time keep me from catching the pants in my chain when riding my bike or dragging on the floor when I walk, which brings me to my next quibble...


They are way too long. For someone wearing a small pant, I feel like I'm hardly on the short side, but these are about an inch or so longer than I would have expected them to be, maybe more like two. I know there's a short version, but it wasn't available when I bought these, and I didn't want to risk getting the short and having it be too short. The pants seem made for someone who is a 6ft+ beanpole, which is what the tall sizes are for, right?


Performance-wise though, they are excellent. The fabric feels VERY durable, much more so than the Alpha SL and Beta SL jackets I own, and the extra-durable parts in the ankle are really nice. The pants repel water well, and even after wetting out, nothing gets through. I'm very pleased with these as far as waterproofing, and that's why they'll get 4-stars, they do what they advertise.


They do tend to get hot, like any waterproof layer, but a little sweat is better than a lot of water, so they're worth it. Typical Arcteryx build quality and performance, just not the fit I was hoping for.


I had considered getting the Beta AR pants as well, for the extra durability, but after seeing those in-person, they were VERY heavy, definitely more of a winter-use product with gaiters and more features. The Alpha SL is more than durable enough for occasional rain use.

3 5

Low-rise.

  • Familiarity: I returned this product before using it
  • Fit: True to size
  • Height: 5' 10"
    Weight: 215 lbs
    Size Purchased: XL

Can't speak to the durability, but they're Paclite; in my jacket experience, if you want a worry-free shell, go with a 3-layer laminate like Gore Pro, Proshell or 3L eVent. Can speak to the fact that they're weirdly low-rise; if you try to pull these on quickly to the level where most pants sit, you're in for a painful surprise. Zeta AR (which I returned these for) and Beta AR are a more normal cut, in addition to being more durable.

Alpha SL Pants on top of Kilimanjaro!

Alpha SL Pants on top of Kilimanjaro!

Above is Haical. He's a Backcountry.com customer that has worked with me trading many calls and e-mails to build a full apparel kit for his summit attempt of Mt. Kilimanjaro.

Here is Haical, wearing his Arc'teryx Alpha SL pants at the summit of Mt Kilimanjaro

If you have any questions or are in need of gear for your up coming big trip; please feel free to reach out to me.

I've helped customer get to the to the top of Kilimanjaro, prepare for hiking the Appalachian Trail, prepare for Mt. McKinley, Mt Rainier and many more.

(Permission provided by customer)

Jared D.
Expert Gearhead
800.409.4502 ext 4055
jdowns@backcountry.com

5 5

Bombproof

  • Familiarity: I've used it several times
  • Fit: True to size

What can be said about these pants that hasn't already been said about the man of steel, bombproof and amazing! These are the last Hardshell pants you'll ever want to own. I've worn them in every condition from single digit temps while trekking in the Wasatch during a blizzard to mobbing around the lowlands in monsoon like rains and they've haven't let me down once. The taped vents don't let a single drop of water in, the kick pads on the bottom resou ist nasty crampon assaults like a champ and the adjustable waist keeps them feeling oh so comfortable all day long! And with the full body zips you can get these things on or off without ever having to take off your boots. With that being said, I'd highly recommend these for any serious alpinist!

Can these be used for ice climbing??

Responded on

I think they would be a great ice climbing pant. Light weight, and they breathe really well. Might not be the warmest or burliest pant, might want to pair them with gaiters so you dont thrash your cuffs.

2 5

Must have back.

  • Gender: Male
  • Familiarity: I returned this product before using it
  • Fit: Runs large

This doesn't just run big, it seems to run huge. I typically can take up to a 32" inseam and a 32" waist (though 30x30 fits best). I had to hike this up to my belly button and cinch the waist as tight as it would go to get it to stay up. Still felt long. Worst of all, the amount of material in the back was hysterical looking. It looked as if I had a gigantic derriere. Will be returning this for sure.

I was really interested to get a full-zip pac-lite pant, but this is just a laughable fit. Still hunting for the right waterproof pant for a short, skinny guy.

Other than the poor fit, the garment seems quite nice. The pant looks and feels great in terms of build quality. However, the waist adjustment system is not as nice as others I've seen. It consists of metal hooks that clip into loops on each side of the waist. This limits adjustment to set increments, rather than being able to cinch it to a precise fit.

Responded on

I have a 31-32" waist and big quads and found that these were too tight in the thighs and derrière; the opposite of what you experienced. I cinched the waist adjustments all the way tight to fit my circumference, but could not do a full squat or walk up stairs without my movement being restricted. Probably generous sizing by Arcteryx's standard, but still not enough for guys big quads and glutes. Nice pants otherwise.

Responded on

I am now trying for my third pair, having tried the M and L sizes. They were too small. I am 6'1 and weigh about 180. I am reasonably fit and not really a big guy. Waist is 34.

I ordered some Marmot's and they are on the way, but with this sale, I have just ordered the XL in hope that they will fit comfortably.

The Larges sort of fit, but it was a bit of a struggle to get them on. As I am looking for something to wear over another pair of pants, that wasn't so good. If the fit doesn't jump to far from L to XL, I think the XL will be just right. Funny for a guy who typically wear mediums. Maybe these are sized as if you are going to wear them over nothing or just some long johns...

Responded on

The XL just arrived today. They fit great over boots and jeans (zipped up half way from the bottom), which was a good test for what I want: rain pants I can easily put on over hiking pants in the middle of a hike.

As I mentioned above, I am 6'1, 180, waist 34. I wear a size 12 boot.

And I have to say that the construction is impressive. These pants have a number of design elements that are very impressive. The draw cord for the cuffs is tethered so it won't flop around and tangle your feet up or get mangled. The waist adjustment is easy to use. There is a snap system at the bottom to keep the bottom zipper from unzipping. And there is more, but I am tired...

5 5

Waterproof Perfection

  • Gender: Male
  • Familiarity: I've put it through the wringer
  • Fit: True to size

Before writing this review, I tried to think of something negative about these pants. Honestly, I can't think of anything I would change about them.
Let's just say this: I recently spent 7 hours hiking in Rocky Mountain National Park in a constantly rotating storm of rain, sleet, hail and snow. Then snow, hail, sleet and rain. Then combinations of rain & sleet, hail and rain, sleet and snow. You get the idea: all the cold, wind and wet the Rocky Mountains can dish up. During the entire hike, I was never wet from the storm nor wet from sweat. Typical of Arc'teryx gear, the cut is trim but plenty of room in the knees and rear for hiking, scrambling, etc.
They are lightweight and very packable. They are a natural for your 10 essentials and will fit in any pack. I am 5' 11", 170 pounds, 34" waist and 32" length; the medium/reg fit like they were tailored for me.
Some may object to the lack of pockets. But you don't need the added weight (& cost) when you consider your hiking pants underneath have pockets as does your rain coat. Speaking of price, you get what you pay for. Arc'teryx price = Arc'teryx quality. I should have bought these last year. Don't make that mistake. Get 'em. Wear 'em. Love 'em.

Waterproof Perfection
5 5

Amazing Pant!

  • Familiarity: I've put it through the wringer
  • Fit: Runs large

These pants are amazing! I bought them just as a storm proof layer but quickly realized they are so versatile. I've used these in all seasons for activities ranging from hiking to snowboarding. There is extra material exactly where you need it so the durability is excellent. I bought the jacket too. It is a bombproof combo. I even grilled out in the rain during the summer and they were excellent inclement weather attire on the home front. I'm 6', 180 lbs, 34 waist, and 32 inseam. I bought a medium and the fit is great. Plenty of room for multiple layers underneath.

Looking to buy these and Atom as well but...

Looking to buy these and Atom as well but i?m between sizes?
6? tall, 34 waist, 32 inseam. Any advice?

Responded on

Here is a link to their trim-fit size chart, which is the fit cut that arc'teryx designed for these pants {http://arcteryx.com/sizing-chart.aspx?EN/men-s-trim-fit-pant-sizing-chart}.
I cannot tell if you could buy, perhaps, a Medium/Tall set of pants, which might help to accommodate your rather unusual set of measurements with regards to what their sizing chart stipulates for pant sizes.
I have no experience with these, so I don't know if you would be able to add the extra 1+ in you would need from a medium regarding the waist size; further, the inseam lengths for XS, S, and M are all the same - 30 1/2 in - but then with a Tall factor it states that one should add three inches, which then may be potentially too long for what inseam length you have specified.
Personally, I would call Arc'teryx and give them your measurements to see if they can give you some more tailored advice, given the person (people) you'll end up talking to will either be able to look at the pants immediately, or will hopefully have had some involvement or acquaintance with them insofar as they will be able to find something that will fit just right. Hope this helps though, sorry I couldn't offer more in the way of pointers or decision-worthy anecdotes.

5 5

Pricey, but nearing perfection

  • Familiarity: I returned this product before using it
  • Fit: Runs large

Full length zippers are uncommon and heavenly. Premium materials, minimalist design, and flawless assembly. The hook system at the waist holds well, doesn't rub, and allows a very small amount of adjustment in fit. The waistband is not lined for bare skin. On the inside, the ankle cuff lacks the burly reinforcement of the rest of the instep.
The fit is very generous in the seat, regular/slightly-trim in the thigh.

5 5

Fits like your favorite pair of jeans

Wouldn't it be great if your favorite jeans were waterproof? For years, folks from Iowa have been trying to make that happen by spraying Scotch-guard on their favorite pantalones in an attempt to make a truly versatile, bomb-proof, all-weather garment.
Arc-Teryx has taken this idea in a different direction with the Alpha-SL pant, making a gore-tex pant that fits like your favorite around-town pant. Now, I'm not recommending you spend this kinda money in bum around town wear (spend $10 on scotch-guard instead!), but wouldn't it be awesome at the end of a day of skiing, skinning, touring, or mountaineering to find yourself in a pair of pants you actually WANT to wear?
I've had these pants for a while now and they stand up to the abuse! These babies are burley, and if you can front the down-payment on your first born child to pay for them, you'll find them well worth the investment!

5 5

Versatile!

As always, Arc'teryx never fails to deliver (I think I'm a little biased to Arc'teryx products at this point). I've only been able to use these pants a few times now and they have been amazing. I love the full side zips, it makes getting them on so easy. I threw these on when it started raining on a winter route and I didn't have to worry about my crampons tearing a hole into my expensive pants. The full zip design is simply the best when it comes to mountaineering hardshell pants. The boot hooks and hem cinch are awesome. I didn't even use gaiters when hiking through the snow; its that good. Also, they're totally waterproof (it is Goretex) with a great DWR coating to bead off the water.

These pants are made from gore paclite, but the face fabric is plenty burly. The paclite makes them super light weight so I have used these pants just as rain pants as well. They breathe very well but I wouldn't want the inner fabric in direct contact with my skin. Be sure to wear long-underwear under the pants if you use them as rain pants.

As a reference, I'm 6' with a 32" inseam and very skinny. The small actually fit great and gives me enough length in the legs. I think the sizing guide is off on all Arc'teryx hardhsell pants though... they seem to run a little longer than suggested by their size charts.

Overall: great, versatile pants that can be used all 4 seasons!