Proton Pant Mens Pytheas
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Proton Pant Mens Pytheas

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  • M
  • L
  • XL
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Product Details

The Proton Pant is a mid-layer, lightly insulated trouser for a variety of mountain pursuits. Breathable, air-permeable outer fabric featuring four-way stretch, combines with Octa® Loft knit insulation, for unimpeded movement with a soft, comfortable fit. Lightweight and durable, Fortius 2.0™ performance polyester blend wicks moisture, for warmth and dryness, whilst a DWR treatment repels external moisture. Trim fit with articulation for mobility, these pants can be easily adapted for wear as an outer piece, or insulation within a layering system. For hiking, approaches and climbing, these versatile pants are fit for use in a variety of alpine environments. Comfortably compatible with a harness, with drop in pockets and an adjustable waistband, these pants are an Autumn/Winter climbing essential. 

  • Breathable
  • Lightly insulated
  • Lightweight
  • Durable
  • Versatile
  • Four-way stretch textile,Octa® Loft breathable insulation provides thermal protection,
  • Airy four-way stretch polyester fabric is soft, comfortable, wicks moisture
  • Layers easily under an outer shell
  • Trim fit with articulated patterning for mobility and freedom
  • Low-profile tapered cuff layers comfortably
  • FC0-DWR (Durable Water Repellent) finish repels moisture
  • Two drop in exterior pockets
  • Adjustable waist drawcord
  • Self: Fortius 2.0™—49% polyester, 35% nylon, 16% elastane
  • Recycled Polyester,Octa® Loft breathable insulation - 100% polyester
Delivery & Returns

UK Standard Delivery

  • UK Standard Delivery is Free for orders over £30
  • UK Standard Delivery is £1.99 for orders under £30

UK Next Day Delivery

  • The cost of Next Day Delivery is £4.99
  • If you order by 2pm, you will receive your order the next working day
  • If you order anytime at the weekend, you will receive your goods on the following Tuesday.
  • Next Day Delivery is not available to the following: Ireland and the Scottish Highlands

UK Returns

  • Free UK returns within 30 days of purchase

Stock Alert

Please alert me via email when this product is back in stock.

Size Guide



Chest 36” 38” 40” 43” 46” 49” 52”
Waist 28” 30” 32” 34” 36” 38” 40”

Chest sizing varies widely depending on the garment, brand or range. Instead we have outlined below a few of the main types of fit found in our ranges and how they compare.


Waist 28” 30” 32” 34” 36” 38”
Leg Length Short Regular Long
  30” 32” 34”