Proton Lightweight Hoody (Men's)


Size Guide
SKU: 295655

Air permeable mid layer insulation with abrasion and weather resistant outer surface.


Fast and Light
Minimalist, high performance and lightweight, for rapid travel in variable conditions.


Alpine and Rock Climbing
Climbing equipment designed for efficient movement and protection in alpine environments.


Breathable Material
Allows moisture vapour to escape, helping regulate temperature and elevating comfort inside garment.

Light, breathable insulated hoody for high-output activities in cold conditions.

*The Proton Lightweight Hoody was previously the Proton FL Hoody.

Climbing durable, trail light, midlayer or standalone, the versatile Proton’s breathable thermal protection delivers comfort across a range of temperature and output levels. Octa® Loft knit insulation provides warmth, resists packing out, and allows airflow to regulate comfort. Abrasion-resistant Fortius™ Air 20 fabric stretches, resists wind, and allows temperature-regulating airflow. A zippered chest pocket secures a radio, articulation aids mobility, and the low-profile insulated hood adds warmth.

Proton Lightweight Hoody (Men's)

Size XS, S, M, L, XL, XXL
Weight 343g / 12.1 oz
Fit Fitted
Model Measurements Height: 5'11"/180.3cm, Chest Width: 39"/99.0cm, Waist: 32"/81.3cm, Inseam: 31"/78.7cm
Wearing Size: Medium
Activity Rock Climbing / Alpine Climbing
Model X000006908
Manufacturing Facility Youngone (CEPZ) LTD, Bangladesh

Full Product Features

Technical Features

  • Breathable
  • Air permeable
  • Light wind resistance


  • Octa® Loft, clean finished, breathable insulation provides thermal protection while maintaining a comfortable micro climate
  • Fortius™ Air 20 face fabric effectively balances air permeability and weather resistance with lightweight durability

Design & Fit

  • Trim fit for athletic performance

Fabric Treatment

  • DWR (Durable Water Repellent) finish repels moisture

Hem Configuration

  • Adjustable hem drawcord

Hood Configuration

  • Adjustable insulated hood


  • Articulated elbows
  • Gusseted underarms for mobility and comfort

Pocket Configuration

  • Two zippered hand warmer pockets
  • Single stretch woven zippered chest pocket


  • Contains materials that meet the bluesign® criteria

Zippers & Fly Configuration

  • No Slip Zip™ front zipper
  • Custom TPU zipper pulls are easy to operate and glove-friendly

Fit: Fitted

Arc'Teryx's trimmer fit is patterned to stay close to the body through the chest, waist, hip, and thigh. Its low profile eliminates bulk, moves with the body, and fits comfortably over first layers or under outer layers.

Materials & Care


  • Octa® Loft breathable insulation - 100% polyester
  • Fortius™ Air 20 - 84% nylon, 16% elastane
  • French Regulation: AGEC Law - Article 13
  • Origin of fabric: TAIWAN
  • Origin of dying: TAIWAN
  • Releases plastic microfibers into the environment when washing


  • Machine Wash Gentle Low
  • Tumble Dry Gentle Low
  • Do Not Bleach
  • Wash Dark Colours Separately
  • Do Not Dry Clean
  • Do Not Iron
  • Do Not Use Fabric Softener
  • Double Rinse

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