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Whether you need shell bottoms for an ultralight alpine climb or for a backpacking trip, the Arc'teryx Men's Alpha SL Pants fit the bill with their minimalistic design and low 9oz weight. Waterproof breathable Gore-Tex Paclite fabric gives these pants the performance to keep you dry through a mountain storm or West Coast downpour. The Alpha SL Pants include a gusseted crotch and highly articulated knees to provide total freedom of movement on steep, technical terrain and rocky sections of trail. Arc'teryx added three-layer instep reinforcements as an added bonus to anyone who has ever shredded a pair of pants with crampons. *Only Available for US Shipment.

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Stay Dry

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

Always stay dry but with great breathability. These are true to size. I have only used them a couple of time but they seem to be very durable.

Great pants so far

  • Familiarity:I've used it once or twice and have initial impressions

Wear it one time on glacier travel in Patagonia Austral... breathability was great on normal wheater.

Used it in Chalten on a rainy day for 2 hours... the alpha's keep me dry.

So far... so good.

Good Product

  • Familiarity:I've used it several times

I wore these on a 6 hours hunting trip in heavy rain, with much walking in tough terrain. The pants kept me dry all day. I did get moist from physical activity, but would say the pants is quite breathabel. I normally use S from Arcteryx, but bought these in M to be able to layer underneath.

I have also used the pants on several fishing trips with only base layer under. I find it to be a good windbreaker as well.

Lightweight and comfy

    I wore these quite a bit on my most recent trip to Alaska as a wind breaker and for rain protection, even though we got quite lucky with the weather and it never poured cats and dogs.

    I love the Goretex material! One day, my lightweight hiking pants got a little wet while canoeing. Back in camp, I just put on the Alpha SL pants right over my wet hiking pants and a couple of hours later, I was completely dry again. The entire time, I stayed quite nice and warm. Another day on a strenuous hike, it never got too hot - hooray for Goretex!

    I also like that there's a fly. No pockets though!

    For me, it was between the Alpha SL and the Marmot Minimalist Pants. I decided for the Arcteryx, because it had a little more room (allows for more layers underneath) and a fly.


      Do not buy these.

      Was mountaineering in Patagonia when the outer fabric delaminated from the goretex, and the zippers came unglued from the rest of the pant. So I found myself in a raging storm with negligible protection because my equipment failed. What happened was the outer fabric delaminated and I literally glued the 2 fabrics together when the same thing happened to the zippers down the leg. Thought I might have torn them myself but... happened on both sides the exact same way, in the same fashion as the delamination occurred. The tears were resultant of the gaping holes caused by this failure.

      These are not suitable for alpine environments, ice climbing, mountaineering, backpacking, rock climbing... I would trust them to walk around a golf course in. Maybe.

      If you are buying these to actually use them go elsewhere. Mountain Hardwear, Patagonia, OR, pretty much anything other than Arcteryx since they moved to China without adjusting their prices and letting their quality slip. Really guys???


      Are you kidding me. These are seam sealed gore-tex paclite, they should be able to be used as an extra waterproof layer when needed where ever he is, without failing like that. What if he was just walking around on a rainy street? The way I see it, these still would have failed. SHAME! And I'm glad you posted this, as I was just about to buy these pants!

      Arc'teryx still holds the torch

        I own the black in a large and I am 6'1''/180 lbs athletic build. I went with a medium first and they fit a little snug and I definitely couldn't wear anything underneath them, so I returned and got a Large and they are great. All Arc'teryx gear is top of the line but sometimes their price tag is a little perplexing...I wore these for a month in the Seward Peninsula/arctic circle region of Alaska and if it is warmer with rain (with pants on underneath) they are a little hot which may be expected but it isn't unbearable and the gore-tex breathes very well compared to any other non-goretex rain pants. They shed water nicely and with the alpha jacket in black you also look pretty badass as well!

        Performace A+, Durability C-

          Got these pants primarily for backpacking in the PNW and some light summer skiing.
          They are very comfortable, pack very small, and are average weight.
          The waterproofing is 100%.
          BUT, both zippers tore away from the fabric at the ankle. Even though Arc-teryx hooked up some different pants on warrantee, I was bummed because I liked these so much.
          Bottom line: excellent pants, not durable enough for skiing.

          Well spent Money

            Hey now! Just thought I'd let potential buyers know that these pants are sweet. Kept them in a shove it pocket for quick access which was needed frequently in July on the JMT. They slipped quickly over my boots without a hitch and not a drop of rain nor breath of wind got through them. I was concerned at first about ease of mobility when clammoring up high steps, but it was a non issue. I also found them to be bomb proof in material integrity in the slot canyons of Utah. Yeah, they are spendy...but worth every penny. Jeff Reid, San Diego

            decent quality product


              I am 6 feet and 31" waist and went for the size medium with tall inseam. I had tried the regular inseam in store and was finding it a bit too short. The tall one is a bit to long though but still work out. I kind of feel the perfect length would be in between these 2 inseam lengths though.

              Medium fits me great... allow room to wear over a pant or not.

              I am not a huge fan of the waist structure though. I would have preferred by far a proper zip and button to close the waist rather than this one piece "elastic" waist.

              The quality of the goretex, seams, and overall finish apart from the waist is very nice.
              I took these pants hiking, biking, canoeing and they sure do a fantastic job at protecting you from the elements. I haven't had any problem so far (like scratches). Though it's a lite goretex, it seems pretty strong but I am pretty cautious and aware of what's around when I move too.

              Recommendation to Arcteryx for future improvements:
              - change the waist system to a pant like with zip and button
              - maybe re-enforced the knee areas the same way than the bottom.
              - keep 2 or 3 different sizes for inseam- add 2 zip pockets on the side

              UL- Balance

                These pants are tops! I am 5'11" - weigh in at 175 pounds and have a 33" waist. The size medium fits well with all articulations in place and room for layering. They perfectly balance lightness of weight and durability and pack down to nothing. I bought these pants (after returning the MH Typhoon) for a fastpacking trip across the island of Hawai'i and they have since become a permanent piece in my UL-Kit. They are classically Arc'teryx in quality and price. Worth the cost as these are pants I trust!

                Could not have asked for anything better?

                  The SL pants were purchased to replace a less expensive pair of pants, and I could not be more pleased with the performance of the new pants while hiking the AT. The Paclite held up well in an all day rain event, and the articulated knees did not bind as I was climbing up and down the stone ledges.

                  Later in the day, the temperature dropped 20 degs. and the inside became slightly clammy and damp, but the pants faired better than any other rain pants I have worn in a similar condition.

                  Great pant

                    I got the SL pant with the SL jacket 4 months ago and I have had the opportunity to use it extensively out hiking in many conditions. The pants are great, light and pack away very well. Add on gaiters and it makes a great outer layer for snowshoeing. I am 6ft 2in and weigh 210 lbs - I got the XL and that allows me to add layers below and still be comfortable. For the jacket, I got the L and I am able to layer no problems and feel comfortable.

                    alpha SL rain pant

                      These are great light weight rain pants. They breathe pretty well, and do a great job of keeping you dry, but they are more of a trail pant. I shredded mine bushwhacking, they now leak like a sieve, and that hurts at $200 a pair. I am 6' 5", 40" waist, weigh 275 lbs, and the knees are not cut right, considerable binding when going uphill.

                      Typical Arc'teryx quality seams, and overall finish, but the waist drawstring adjustment slide is completely bogus. The designer must have thought it would be cute to make it small, and hard to work with numb fingers. They lose two stars for that, and the price.

                      Arc'teryx quality for sure

                        I cannot believe I haven't reviewed these sooner! I bought these from BC about a year ago. They have fantastic construction from the sealemd seams, to the measurement and sizing. I am 5'8 150 athletic build, waist 32 and the M was perfect. In fact Arc'teryx desgined these pants to be big enough in your normal size that accomadates for putting these over another layer. So I recommend sticking with whatever normal size you wear. Performance wise I used these in a tropical storm with high winds heavy-sideways rain and was dry as a bone. I also used these in about 8 inches of snow as my outer layer because I lost my insulated ski pants, but with some base layering, these pants were amazing, again dry as a bone, I sat in the snow and rolled around too, I was impressed. Lastly, if you're not convinced yet, I used these to cross a river in the Shenandoah Park, granted it was about 2-3 feet deep (thigh high), but I put these on and made sure my boots were ready too and headed across, again bone dry, I felt the cold of the fall water through them but no water made it through anywhere. Overall, buy on sale if you can I did about $130, but they are worth every penny, a must have in your outdoor arsenal!

                        Light and Dry

                          These pants are the bomb. I wore them on a recent backpacking trip where we were hiking in a constant rain for 10 to 12 hours with temps in the mid 30s. They were totally dry, light, and fended off light briers and sticks without a scratch. I initially went with the XL to go over my pants, however, later I decided if I am going to wear these I'll just take my pants off because the LT was a much better fit for hiking in. I am 6'4", 215 with a 36" waist and the XL just kept falling down and the crotch was way too low to hike in.

                          I'm a big guy - but need a 30" inseam....

                          I'm a big guy - but need a 30" inseam. Does Arcteryx make anything for us in a wind/rain pant?

                          I have the same issue. Just found the Arc Teryx Alpha Sl pants in XL Short (30") fit me great. I am 31" inseam, 36" waist with thick legs. I found the XL Short is just the right length and leaves enough room to fit over hiking pants.

                          Can these pants realistically be worn...

                          Can these pants realistically be worn during March on Springer Mountain GA? I am looking for hiking pants that can serve multiple purposes during a thru hike on the AT which includes cold snowy weather in the mountains of GA, NC TN.

                          How do you adjust the pants around the...

                          How do you adjust the pants around the waste? It does not look like they have belt loops.

                          I am undecided between M and L - my jeans...

                          I am undecided between M and L - my jeans are 33", but if I measure my waist it's way more than 33", closer to 36". Now, I also got Arcteryx Gamma AR pants, and couldn't fit inside M size (just slightly too tight) - anyone know if the measure from the waist is the same between these two pants? As I am slim, I would prefer size M for less baggy pants, if they would fit from the waist.

                          The size of the two pants should be the same. The one difference with the alpha is the fit in the waist. The alpha comes with an athletic fit which allows it to stretch, compared to the Gamma pants which have a trim fit.

                          Based on you having a 36" waist I would go with a Large. Also if you are tall ( 5'11 and up) you should go with the tall inseam, but if not just go with the regular inseam

                          Hi, Could you please tell if Carbide color...

                          Could you please tell if Carbide color pant is like a light beige?

                          I am very tired of carrying separate...

                          I am very tired of carrying separate waterproof rain pants that feel and look like the ones off an MC Hammer video clip. I want ONE pair of pants that feel ultra comfortable that I can use as my permanent (rain or not rain) hiking pants. They must be totally water proof and tough enough to wear at all times. Any ideas?

                          These would work great and have reinforced bottom cuffs, but like any waterproof pants, you're going to be pretty hot if it's warm weather. You'll get better breathability and durability by going with something made from Gore ProShell (of course, they're more expensive too) You could check the Alpha LT 1/2 bib for another option.

                          Fjallraven's bushcraft pants (about 40 different types!) have no equal in versatility, but they're hard to get, and pretty expensive. I'm wearing a pair of Kebs right now, and I could not be any more stoked about a pair of pants. They're -the- most comfortable pants I have -ever- had. If, after research, they're something you're interested in, will ship to the US. I rarely carry rain pants either, stopping to put on -another- pair of pants has always seemed ridiculous. I'd recommend quick dry nylon RailRiders, which are tough enough for anything, but they're not completely waterproof, just water resistant.

                          Any idea when you will be getting more...

                          Any idea when you will be getting more tall sizes in? Specifically, Carbide MT?

                          I ware a 34in with a 28in inseam, I will...

                          I ware a 34in with a 28in inseam, I will be waring this while ATV riding, when it rains I want to be able to pull them on over my jeans and shoes, so, what size would you recommend? The style is the Aphla S L pants.

                          Best Answer

                          From the sizes available here, there's nothing that's going to fit you, but if you find them, you'll want a size L/Short. I would be a little concerned over riding my ATV with these pants though. They're thin, and even though they'll handle some snagging and wear for their intended purpose, if you stack or crash brush on the fly, you're going to rip a $200 pair of pants to pieces instantly. Seems like you could find something more appropriate and cheaper at your local motorcycle or hunting gear store. I'll leave that to you to decide, but since it would be the deal killer for me, figured I might as well put it out there as something for you to consider.

                          Another thing- When I ride my quad out on the ranch in the rain, I wear a pair of Viking Tempest 2 full-zip pants. Think I paid about $40 for them. Does the job, and I don't get upset when I trash them.

                          Can I wear the pants bicycle touring? ...

                          Can I wear the pants bicycle touring? Will they breathe well enough for the mountain west, and does the cuff extend far enough to get caught in a bicycle's drive train?

                          These pants are Paclite Gore-Tex, so they will breathe pretty well. As far as getting stuck in your drive train, you can always roll up your right leg a little bit. These pants do have the interior scuff guards designed to protect the pants against ski edges and crampon shredding. Bottom line is that these would do darn well for bicycle touring.

                          hope this helps

                          I use these pants for climbing and they are perfect. 200 bucks it extremely to high of a price but they are the only pair you would need for multiple outdoor sports. With that said I think biking is the only sport that I would not recomend wearing these pants. I have actually found that they do not breathe at all. Biking creates far to much body heat, I think you would regret wearing these. I would atleast try a convertable pant instead. Thats of course my humble opinion.

                          What's the inseam on M Tall?

                          What's the inseam on M Tall?

                          I was thinking about purchasing the Arc...

                          I was thinking about purchasing the Arc Teryx Alpha SL pant. I noticed the zippered leg opening was not a full side zip, but only from a little below the knee down. My question is whether when wearing light to medium weight hiking boots you can take the pants on or off without removing your boots?

                          I don't believe you would be able to. The zipper does come up to just below the knee and it is pretty narrow from there up to the crotch. I don't think that you would want to run a wet boot through there. I wear what are technically trail running shoes and I don't think I could put my foot through without damaging the pants (the paclite is pretty tough but I imagine you could tear it pretty easily with a shoe). It seems that the main advantage of the zipper is for venting.

                          I just bought these pants after reading the review on here. The answer is yes- I tried putting these on & taking them off with sneakers on. Then (just to make sure I covered every base for other readers here) I did it again with sandals, and again with my heavy-duty hiking boots. Result- I had no issues putting on & removing the Large size pants over my size 11 heavy leather boots. I am 6' tall, 180 lbs, with a 30" inseam, and 35" waist, and these pants fit me beautifully. My only complaint with the pants so far is the lack of pockets. This is offset though by the fact that these pants roll up to the size of a burrito, and only weigh 9 ounces.

                          I mistakenly sent back the pair of large...

                          I mistakenly sent back the pair of large AArc'teryx Alpha SL pants. I want to have them again but it seems you don't have a large that true? Please let me know. Thanks so much.

                          Pockets: 2 None?

                          Pockets: 2 None?

                          Pockets? Who needs pockets? thats what fannypacks are for. Really, I was disturbed by the fact that I purchased a pair of $200.00 pants and they don't even have pockets. I like them but if I could go back in time I would think twice about purchasing these pants. Like I said their good pants but I could find something just as good for about $60.00 if you don't mind them saying Columbia on them.

                          Why are these $300? I just bought a pair...

                          Why are these $300? I just bought a pair for $ 200.00! All other retailers are selling them for $199!