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  • Arc'teryx - Sigma FL Pant - Men's - Black
    Arc'teryx - Sigma FL Pant - Men's - Cinder
    Arc'teryx - Sigma FL Pant - Men's - Infrared
    Arc'teryx - Sigma FL Pant - Men's - Neptune
  • Arc'teryx - Sigma FL Pant - Men's - On-Model Back
    Arc'teryx - Sigma FL Pant - Men's - Detail
    Arc'teryx - Sigma FL Pant - Men's - On-Model Back
    Arc'teryx - Sigma FL Pant - Men's - On-Model Front
  • Arc'teryx - Sigma FL Pant - Men's - Detail
    Arc'teryx - Sigma FL Pant - Men's - Detail
Arc'teryx - Sigma FL Pant - Men's

Arc'teryx Sigma FL Pant - Men's

26% Off
$139.98 - $141.75 $189.00

Select style & size:

Select options
  • Select options
    • Black, S/Tall
      sale $139.98
    • Cinder, L/Short
      sale $141.75
    • Cinder, M/Reg
      sale $141.75
    • Cinder, S/Reg
      sale $141.75
    • Cinder, S/Tall
      sale $141.75
    • Cinder, XL/Reg
      sale $141.75
    • Cinder, XL/Short
      sale $141.75
    • Black, M/Tall
      sale $139.98
    • Black, M/Short
      sale $139.98
    • Black, M/Reg
      sale $139.98
    • Black, L/Short
      sale $139.98
    • Black, L/Reg
      sale $139.98
    • Black, XL/Short
      sale $139.98
    • Black, XL/Reg
      sale $139.98
    • Black, XL/Tall
      sale $139.98
    • Infrared, S/Short
      sale $141.75
    • Infrared, S/Tall
      sale $141.75
    • Infrared, M/Reg
      sale $141.75
    • Infrared, M/Short
      sale $141.75
    • Infrared, M/Tall
      sale $141.75
    • Infrared, L/Tall
      sale $141.75
    • Infrared, L/Reg
      sale $141.75
    • Infrared, L/Short
      sale $141.75
    • Infrared, XL/Reg
      sale $141.75
    • Infrared, XL/Short
      sale $141.75
    • Infrared, XL/Tall
      sale $141.75
    • Neptune, M/Tall
      sale $139.98
    • Neptune, M/Short
      sale $139.98
    • Neptune, L/Short
      sale $139.98
    Quantity:
    +

    Tech Specs

    Material:
    Fortius 1.0 (85% nylon, 15% elastane), DWR treatment
    Fit:
    trim
    Pockets:
    2 hand, 1 hip
    Waist:
    adjustable, integrated belt
    Claimed Weight:
    13.1oz
    Recommended Use:
    hiking, mountaineering, sport climbing, trad climbing
    Manufacturer Warranty:
    limited

    Sigma FL Pant

    The Arc'teryx Men's Sigma FL Pant is a lightweight pair of softshells suitable for summer mountaineering and alpine climbing. Its Fortius 1.0 fabric is the lightest softshell from Arc'teryx, and it boasts a four-way stretch, exceptional breathability, and reliable water-resistance for ideal protection in the alpine during warmer seasons. Arc'teryx designed it with a trim, articulated fit that ensures full mobility on the mountain despite its slimmer look.

    • Lightweight softshell pant designed for climbing and mountaineering
    • Fortius 1.0 fabric is stretchy, breathable, and water-resistant
    • Double reinforcements ensure long-lasting durability
    • Trim fit includes articulated design for freedom of movement
    • Low-profile webbing belt stays secure under harnesses

    Favorite Hiking Pants

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

    These have been the best pants that I have worn hiking and climbing yet, they are super stretchy, comfortable and fit really well.

    Highly recommend.

    Purchase Other Colors Besides Black

    • Familiarity: I gave it as a gift but have feedback to share
    • Fit: Runs small

    I got these in black for my dad, which is somewhat a bad idea. They pick up quite a bit of lint and dust and black is not the best color to hide that. Additionally, the pants are a lot more slim fitting than the other Arc'treyx pants he own. He didn't size up so they are a bit tight. However, these pants are pretty comfortable for my dad and he wears them quite frequently.

    Great pants - wrong size

    • Fit: Runs large
    • Size Bought: Large

    Great product, impossible to tell what size you need without trying them on. I am 6' tall and 180lbs and slim (12% body fat) and the large was too big in both the waist and length.

    Nice climbing pants

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

    I have ordered S/reg in stellar color. Pants look really nice but color is not as bright as on the website.
    I'm 5'11", 150lb and 29-30 inch waist. The fit is perfect, slim but not tight. I can comfortable sit and move around.

    Great for summer climbing

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

    I initially bought a size L based on other reviews but it was a little big, so I returned it for an M size, which was definitely snug but not excessively so and I really like the slim profile. I have just got back from a 6-day summer alpine trip, worn virtually continuously and the pants worked out really well. Shed wind and dried fast, stretchy but kept its shape, useful zip pockets for bars or lip balm etc. Sitting in the snow for short periods was fine. Fitted over high ankle mountaineering boots very well. Looks fine in the bar and cafe. Definitely recommended.

    Slim fitting, comfortable, good quality

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: Large

    The sigma has a slim fitting, tailored look with tapered bottoms. The material is high quality with a clean finish and looks good. The fit is comfortable due to the stretch with no baggy areas.
    They're an all around good pant for running errands or hiking trails. They are not the cheapest but the quality is definitely there.

    Awesome climbing pants

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: Medium Tall

    I'll echo what Stan stated in his review about the sizing. A bit trim for an Arc'teryx medium. I found the Medium still fit me like the Gamma LT and Gamma rock but snugger on the waist,
    These pants are perfect for cool weather climbing and being in the mountains. Durable on the knees and seat like the Gamma rock but with a bit thicker fabric elsewhere for cooler weather.
    I love that they added a thigh pocket!
    Can't speak to the long term use yet but they're been awesome for climbing and some cold weather backpacking.
    If you're in the lower end of the size chart, size up. I went with the Tall for extra ankle coverage, I could easily have got the Large and and some room to tighten the belt.

    A Note on Sizing

    • Familiarity: I've used it several times
    • Fit: Runs small

    I struggled getting the fit dialed in with these pants so I thought I'd post here to help others. About me: I'm 6'1", weigh 170-175, 33-34 inch waist and 33-34 inch inseam. Pretty typical climber build: tall and lanky. If you're anything like me, forget about the medium, even though it says 33 inch waist. The Arcteryx rep at the Denver store told me that the medium is actually sized from 31-33. For me, I could barely put them on. I got a large, tall and they fit perfectly.

    I’ve used these a number of times climbing ice in CO this season, from warm days on dripping wet pillars to freezing and windy days on bulletproof ice, and these pants kept me dry and kept the wind at bay. Highly recommended!

    Hey Stan,

    Did the pants fit over your ice climbing boots?

    Thanks!

    To Kirk Anderson,
    Sorry for the delay. Yes, the pants fit great over ice boots. They also have an internal drawstring at the cuff that allows you to cinch them pretty tight over the tops of the boots.

    Super Comfy

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

    Love the cinch for the leg opening. Not a hassle to use at all, unlike other pairs I've used in the past. The fit seems to be somewhat small in the waist, but that's about it. Everything else feels great.

    Arc'teryx

    Men's Apparel
    Alpha Sizes
     XSSMLXLXXL
    Chest

    36in

    (94cm)

    38in

    (97cm)

    40in

    (102cm)

    43in

    (109cm)

    46.5in

    (118cm)

    50in

    (128cm)

    Waist

    29in

    (74cm)

    31in

    (79cm)

    33in

    (84cm)

    36in

    (92cm)

    39.5in

    (100cm)

    43.5in

    (110cm)

    Hip

    36in

    (92cm)

    38in

    (97cm)

    40in

    (102cm)

    43in

    (110cm)

    46.5in

    (118cm)

    50in

    (128cm)

    Sleeve

    32in

    (81cm)

    33in

    (84cm)

    34in

    (86cm)

    35in

    (89cm)

    36in

    (91cm)

    37in

    (94cm)

    Crotch to Floor:
    Short

    30.5in

    (77cm)

    31in

    (79cm)

    31.5in

    (81cm)

    32.5in

    (82cm)

    Crotch to Floor:
    Regular

    32.5in

    (82cm)

    33in

    (84cm)

    33.5in

    (86cm)

    34.5in

    (87cm)

    Crotch to Floor:
    Tall

    35in

    (90cm)

    36in

    (92cm)

    36.5in

    (93cm)

    37in

    (95cm)

    Numeric Sizes
     282930313233343638
    Waist

    28in

    (71cm)

    29in

    (74cm)

    30in

    (76cm)

    31in

    (79cm)

    32in

    (81cm)

    33in

    (84cm)

    34in

    (86cm)

    36in

    (91cm)

    38in

    (96cm)

    Hip

    35in

    (89cm)

    36in

    (92cm)

    37in

    (94cm)

    38in

    (97cm)

    39in

    (99cm)

    40in

    (102cm)

    41in

    (104cm)

    43in

    (109cm)

    45in

    (114cm)

    Pant Inseam

    32in

    (81cm)

    33in

    (84cm)

    33.5in

    (85cm)

    34in

    (86cm)

    35in

    (89cm)

    Crotch to Floor:
    Short

    30in

    (77cm)

    30.5in

    (78cm)

    31in

    (79cm)

    31.5in

    (80cm)

    32in

    (82cm)

    33in

    (84cm)

    Crotch to Floor:
    Regular

    32in

    (82cm)

    32.5in

    (83cm)

    33in

    (84cm)

    33.5in

    (85cm)

    34in

    (87cm)

    35in

    (89cm)

    Crotch to Floor:
    Tall

    35in

    (89cm)

    35.5in

    (90cm)

    36in

    (92cm)

    36.5in

    (93cm)

    37in

    (94cm)

    38in

    (97cm)

    How to Measure:
    For best results, take measurements over your underwear.
    Chest:
    With arms relaxed at your sides, measure under your arms, around the fullest part of your bust/chest.
    Waist:
    Measure around your waist at the narrowest part.
    Hip:
    Standing with feet hip width apart, measure around your hips at the widest part.
    Inseam:
    From standing position, measure from your crotch to your ankle.
    Sleeve:
    With arm relaxed at your side and slightly bent, measure from center back neck, across shoulder to elbow and down to wrist.
    Crotch to Floor:
    With bare feet, measure from your crotch down the inside leg to the floor.
    *Actual inseam length will vary depending on what Arc'teryx deemed suitable for end use footwear.