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Alpha SL Pant


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Alpha SL Pant Men's Ultralight, packable, waterproof and breathable GORE-TEX® alpine pant designed for emergency weather protection. Alpha Series: Climbing and alpine focused systems | SL: Super light.

Ultralight, packable, waterproof and breathable GORE-TEX® alpine pant designed for emergency weather protection. Alpha Series: Climbing and alpine focused systems | SL: Super light.

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XS, S, M, L, XL, XXL
Regular, Short, Tall
365 g / 12.9 oz
Athletic Fit, with e3D patterning, Trim-fit cuff
Sizing Chart: 
Gender Equivalent Product:
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Delivering optimized performance for minimal weight, the ultralight Alpha SL Pant packs small, ready to provide emergency weather protection when needed. N40r GORE-TEX® fabric with Paclite® product technology is waterproof, breathable and exceptionally light. The nylon ripstop face offers some abrasion and tear resistance. Where higher levels of durability are required, Arc’teryx uses hardwearing N150p-X GORE-TEX® fabric.


Built to handle wide range of alpine pursuits while weighing as little as is functionally possible, the Alpha SL Pant uses only essential features. Drawcords at the hem work with a tuck away bootlace hook to provide a secure, full coverage fit, even while climbing. The dual waist adjusters fit comfortably under a pack or harness, and the trim leg fit reduces crampon snags and allows for more effective layering. The Athletic fit with e3D patterning maximizes ergonomic freedom.


An example of the Arc’teryx commitment to performance focused design is the Alpha SL’s side zip system. Running the length of the pant, the zipper separates completely, making it easy to put on and take off the pant as weather shifts. By partially unzipping each side at the top, the system creates a drop seat, a feature that is truly appreciated when needed. Arc’teryx WaterTight™ zippers are used for a streamlined, snag free profile.

Learn More About This Product

Arc'teryx Fit Guide - e3D

Ergonomic 3-Dimensional (e3D) patterning brings an additional level of articulation to provide enhanced range-of-motion in our Trim, Athletic, and Expedition fit categories. The application of e3D patterning allows for enhanced mobility for sport-specific activities in challenging environments.

Arc'teryx Fit Guide - Athletic Fit

Standing in as our “Arc’teryx Standard” fit, the complex patterns used utilize anatomical shaping and gussets to enhance motion and eliminate excess bulk. Trimmer than the Relaxed fit with room for a base layer, a light fleece mid-layer and a synthetic or down filled mid-layer.

To find out how to calculate your body measurements, view our Sizing Charts:

Men's Tops | Men's Bottoms
Women's Tops | Women's Bottoms


Climbing and alpinism focused pieces: harness compatible length and waistline; chest pockets accessible while wearing a pack or harness; maximum articulation for overhead motions; helmet compatible hoods; drop hem; highest possible durability-to-weight ratio; emphasis on lightweight materials.

SL | Super Light

Uses the lightest weight materials available to provide high weather protection, performance and/or packability, but with the right amount of durability.

Full Feature List

  • Waterproof
  • Breathable
  • Lightweight
  • Compressible and packable
  • DWR finish (Durable Water Repellent) helps repel water from fabric surface
  • Micro-seam allowance (1.6 mm) reduces bulk and weight
  • Articulated knees
  • Gusseted crotch
  • WaterTight™ full separating two-way side zippers
  • Snap cuff-closures
  • Adjustable pant cuff drawcord
  • Lace hook
  • Adjustable waist
  • Pull-on style with elasticized waist
  • Note: Our WaterTight™ zippers are highly water resistant, but not waterproof. We do not recommend keeping items in your pockets that may be damaged by moisture
  • Reinforced instep patch


  • N40r GORE-TEX® fabric with PacLite® product technology
  • N150p-X GORE-TEX® fabric with Paclite® product technology reinforcements


  • Machine wash in warm water (30°C).
  • Double rinse.
  • Do not use fabric softener.
  • Tumble dry on medium heat.
  • Do not iron.
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