Free 2-Day Shipping on Orders Over $50

Detail Images

  • Arc'teryx - Detail
  • Arc'teryx - On-Model Front
  • Arc'teryx - Detail
  • Arc'teryx - On-Model Back
  • Arc'teryx - Detail
  • Arc'teryx - Detail
  • Arc'teryx - Alpha SL Gore-Tex Pant - Men's - Black
  • Arc'teryx - Detail -
  • Arc'teryx - On-Model Front -
  • Arc'teryx - Detail -
  • Arc'teryx - On-Model Back -
  • Arc'teryx - Detail -
  • Arc'teryx - Detail -

Current Color

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

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


Free 2-Day shipping on orders over $50. Learn More

Select a Size:

Select options
  • Select options
    • S
    • M
    • L
    • S/Short
    • XL
    • XXL
    • S/Tall
    • M/Short
    • M/Tall
    • L/Short
    • L/Tall
    • XL/Short
    • XL/Tall

    Select a Color:

    Select options
  • Select options
    • Black

    22 Reviews


    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
    • Item #ARC3525

    Tech Specs


    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Kept me dry in Walleye weather

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: L/Tall
    • Height: 6'3"
    • Weight: 215lbs

    I was in search of a heavier weight gore-tex rain/all weather pant that was also packable which would be primarily used during my annual walleye fishing trip to Northern Ontario. The pants pack down very well into my boat bag and getting in/out of the pants, even with layers on, is very easy due to the full pant zips on each side. This past fishing trip, we had a couple of days straight of rain/wind, wore these all day and I stayed 100% dry (paired with a Stio Modis jacket - which I also highly recommend). When the rain/clouds broke - the weather remained cool due to the cold front that moved through with the rain. The pants held up to the constant wind for the rest of the trip/kept me warm and the gor-tex material shed water/fish slime well from the constant barrage of catching walleye and dealing with the occasional large Northern Pike. I typically wear a size 34 for my jeans, but I wanted a bit of a larger fit so I went with the Large/Tall size - which is the exact fit I wanted.

    Light and Simple

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

    I wanted a lightweight and easy to pack shell pant with full side zips for mountaineering to make it easy to put the pants on without taking off my boots and crampons. These pants are great for that. They pack down super small and are hardly noticeable in my pack.

    Awesome, lightweight shell

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: M Tall
    • Height: 6'0"
    • Weight: 180lbs

    These pants are awesome. Gore-tex paclite is so incredibly durable for how lightweight and breathable it is. I usually wear this in combination with the ALPHA SL jacket for a wide variety of things. Snowshoeing, Skiing, Trail Running in adverse weather and wind, hiking and camping.
    Both the pants and jacket are perfect to bring with you in your pack on any outdoor excursion in case the weather goes south, they're so pack able and lightweight you barely notice them.
    I recently did a 150 mile bike ride and had these in my pack and sure enough when it started raining I was able to pop them on quickly and avoid being drenched.
    One last great thing about these pants is that the can be completely put-on and removed due to the side zips.
    One last, last thing is for me to comment on durability. I often wear these bushwhacking in the back country with my snowshoes as well as along river banks when I'm scouting rapids I'm about to run with my kayak. I've probably put them through more abuse than they deserve but after a year there are still no holes or other signs of wear and tear.

    Are you convinced yet?

    Keeps the elements out

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: M/Reg
    • Height: 6'0"
    • Weight: 130lbs

    I picked up a pair of these bad boys so that I can snowshoe, cross country ski, and backcountry ski all in a single shell. I love the lightweight and packable construction of the pants, thanks to the goretex paclite material, which allows me to move with ease and stow the pants even easier if the weather is nice. Perfect lightweight shell for tame outdoor excursions

    Need 3-way zipper

    • Familiarity: I returned this product before using it
    • Fit: True to size
    • Size Bought: Large Tall
    • Height: 6'5"
    • Weight: 200lbs

    Wanted to love these pants, but the side-zips are inadequate for my purposes. If you need them for easy on and off with boots they will work great, but if you are hoping to use them for venting, look someplace else. With only a 2-way zipper, you can only vent from the top by the waist band, or the bottom by the boots.


    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: xl
    • Height: 6'1"
    • Weight: 220lbs

    Wore in 50 mile per hour winds, rain and snow on Rainier. Stayed warm and dry. Fit was fine, was able to put on with boots on easy. I am a 36/32 in jeans and bought an XL. They fit me slightly on the big side but overall fit was fine over my soft shell pants. Large's were too restrictive for me so the XL provided better room for walking, climbing and glissading. I have also warn these to my favorite sporting events

    Perfect minimal shell pant

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: large
    • Height: 5'11"
    • Weight: 185lbs

    I wanted full side zip pants I could put on or take off under any conditions (boots, harness, etc) in a weight that made sure they were always in the pack. These deliver on all fronts, and are exceptionally well constructed, extremely water and wind proof, have many well thought out design features for a minimalist pant (front zipper). Lack of a front button takes some getting used to, but the side hook attachment means you don't end up with a fat wad of built up material under your pack strap. Although the material is rigid, I find the range of motion adequate for uphill steps without noticeable bind (typically my biggest complaint in hard shells). I thought these were a little snug for an everyday ski pant, but would not hesitate to throw in the pack for a spring tour. Used these working all day in the rain, skiing all day in the snow, sitting through a rainy football game, hiking in the cascades. 4 thumbs up.

    potato sack, not athletic cut pants

    • Familiarity: I returned this product before using it
    • Size Bought: S and M
    • Height: 5'8"
    • Weight: 165lbs

    VERY DISAPPOINTING pants due to 1) very hard to get on (result of no front button, hard to close zippers) 2) restricts movement (result of poor design - no articulated knee or gussets) 3)weird fit (too much slack in back, would think same for everyone). 4) no pockets. Don't believe the hype for Arcteryx. People must be impressed just because of high price tag. Critical people will be underwhelmed with this. Didn't use it but spent a lot of time trying it on, trying everything to make it work. Neither S or M would allow good movement. (Old Moonstone pants so so much better.) Good: boot lace clips hide well when you don't want them, that's cool.

    Versatile Pant

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size

    The full length side zippers are completely solid, and the fit was true to size. So far, they have held up well in heavy rain, wet snow and moderate winds.

    good fit

    • Familiarity: I gave it as a gift but have feedback to share
    • Fit: True to size
    • Size Bought: Small

    gave this as a gift and they are waiting to use them in a climbing trip but they have a good fit. Will update with performance

    Growing Room

    • Height: 6'7"
    • Weight: 245lbs

    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.

    good for bike commuting

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

    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.

    non Alpine non rain outdoor activities.

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: L
    • Height: 6'0"
    • Weight: 172lbs

    Alpha SL Pant, this paragraph of hard shell pants while based waterproof and wear resistance than the more advanced style, but in non extreme weather, meet the general environment is enough, such as suburban mountain hiking etc.. Gorgeous color. At an affordable price.

    Alpha SL Pants on top of Kilimanjaro!

    Above is Haical. He's a 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

    Alpha SL Pants on top of Kilimanjaro!


    • 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!

    Must have back.

    • 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.

    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.

    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...

    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...

    Waterproof Perfection

    • 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

    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?

    Here is a link to their trim-fit size chart, which is the fit cut that arc'teryx designed for these pants {}.

    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.