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Psiphon SV Pant


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Psiphon SV Pant Men's Crafted for climbing in severe alpine conditions, the Psiphon SV Pant is the warmest Arc’teryx softshell pant.

Crafted for climbing in severe alpine conditions, the Psiphon SV Pant is the warmest Arc’teryx softshell pant.

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XS, S, M, L, XL
615 g / 1 lb 5.7 oz
Trim fit, Tapered leg
Sizing Chart: 
Gender Equivalent Product:


The Psiphon SV Pant is specifically created to provide durable weather protection and warmth while allowing a climber to move efficiently and effectively in severe alpine conditions.


Air permeable, four way stretch Fortius™ 3.0 softshell uses a nylon/elastane fabric laminated to mid-loft, heavyweight stretch fleece to deliver elevated thermal performance, weather protection, abrasion resistance and stretch. Burly™ Double Weave softshell reinforces the lower leg. Advanced articulated patterning and strategically placed gussets provide climbers with the ability to move effectively without compromising coverage.


Arc’teryx designs focus on achieving the highest degree of function for a specific purpose. The Psiphon SV Pant is optimized for climbing. The trim cut is carefully patterned to reduce fabric and seams that could snag crampons, particularly in the lower leg. Webbing loops are integrated to accommodate gaiter straps (not included) that will help keep snow out of your boots in deep snow conditions. The low profile waistbelt adjuster is glove and harness friendly, and removable suspenders add a level of security. Two thigh pockets: one zippered pocket securely holds small essentials, and Velcro flapped dump pocket provides quick access, even with gloves on.


The Psiphon SV pant and other Arc’teryx Ascent products stand alone, but really shine when coming together as technically advanced systems that help maximize personal performance in harsh alpine environments. Clothing layers, harness, helmet, backpacks, and crampons are all considered part of the system. Knowing how a climber moves informs the designs, which are built to work in unison according to the intended style of use. Arc’teryx leverages premium craftsmanship, construction innovations and ergonomic patterns to create products that work together to deliver the highest degree of function and hardwearing protection from the least possible weight.

Learn More About This Product

Arc'teryx Fit Guide - Trim Fit

These trim fitting garments share motion-friendly traits with our Athletic fit, but are patterned with lower volume for reduced bulk. Our trim fit is sized for a base layer and a trim 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

SV | Severe Weather

Employs the most durable materials for prolonged use and provides the most weather protection in the harshest weather conditions.

Full Feature List

Technical Features
  • Weather resistant
  • Serious warmth protection
  • Highly durable
  • Micro-seam allowance (1.6 mm) reduces bulk and weight
  • Mechanical stretch textile for unrestricted mobility
  • Hybrid Construction
  • Tapered legs for efficiency when walking with crampons
  • Trim fit keeps warmth close to the body
  • Articulated knees
  • Gusseted crotch
Zippers & Fly Configuration
  • Front fly with button closure
  • Wind flap
Cuff & Sleeves Configuration
  • Internal webbing cuff loops can be used to keep pant cuff down (straps not included)
Waist & Belt Configuration
  • Removable low profile suspenders
  • Soft, brushed lined waist
  • Glove friendly adjustable integrated webbing belt
Pocket Configuration
  • Thigh pocket with laminated zip
  • Thigh drop pocket
  • Thigh pockets sit just below a climbing harness leg loops
  • Seamless instep
  • Burly™ Double Weave reinforcement at lower leg helps reduce crampon damage and snags


  • Fortius 3.0™—65% polyester, 21% nylon, 14% spandex, 414 g/m². A membrane-free, air permeable, four-way stretch nylon/spandex fabric, laminated to a mid-loft, heavy-weight stretch fleece.
  • Burly™ double weave—46% nylon, 46% polyester, 8% elastane, 275 g/m². A hard-wearing, durable, stretch woven fabric with a smooth outer face and a soft inner face that is comfortable next to the skin. A DWR (durable water repellent) coating helps shed moisture.


  • Machine wash in cold water.
  • Wash dark colours separately.
  • Tumble dry on low heat.
  • Iron on low heat.
  • Do not use fabric softener.
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