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Proton LT Vest Men's
Proton LT Vest Men's

Midweight air-permeable insulation that self-regulates to prevent overheating.

USD $ 199.00

Proton LT Vest Men's Pilot
Proton LT Vest

Proton LT Vest Men's

Midweight air-permeable insulation that self-regulates to prevent overheating.

USD $ 199.00

Select a colour:

Proton LT Vest Men's Black
Proton LT Vest Men's Pilot

Select a size:


Free Express Shipping / FREE RETURNS



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



High performance, minimalist design that is durable for its weight.

Alpinism and Climbing

Alpinism and Climbing

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

Synthetic Insulation

Synthetic Insulation

Man-made insulation with quick dry times, durability and retains warmth when damp.

Proton LT Vest

Providing core body insulation while maximizing freedom of movement, the highly air-permeable Proton LT Vest performs as a softshell and midweight insulated mid layer. Advanced material technologies balance wind, weather and thermal protection while allowing air to pass at a carefully designed amount. This ability to enable air flow helps prevent overheating and vapour accumulation, allowing the Proton LT to deliver comfort over a wide range of temperatures, conditions and output levels.


XS, S, M, L, XL, XXL


230 g / 8.1 oz


Trim fit, Hip Length, Centre back length: 75 cm / 29.5 in

Sizing Chart:

Men's Top Sizing Chart


Rock Climbing / Ice Climbing / Alpine Climbing / Expedition



Full Product Features

Technical Features

  • Abrasion resistant
  • Water resistant
  • Air permeable
  • Wind resistant

Design & Fit

  • Trim fit for athletic performance

Collar Configuration

  • Stand up collar
  • Insulated collar
  • Mid-height collar layers easily

Zippers & Fly Configuration

  • No Slip Zip™ front zipper
  • Dual back flaps on main zipper prevent wind penetration

Hem Configuration

  • Drop back hem
  • Dual lower hem adjusters

Pocket Configuration

  • Chest pocket with zip
  • Two insulated hand pockets with zippers

Fabric Treatment

  • DWR (Durable Water Repellent) finish repels moisture

Arc'teryx Layering System

Layers are the instruments of keeping you dry, warm and using your energy efficiently. Put into the right systems, a good sequence of layers provides you with weather protection, moves moisture away from your skin, conserves or dissipates heat, and does this in the least amount of time.

The graph shows where this product sits within a layering system. Use the layering guide to select additional pieces for your system and understand how they fit together. Find out more about how to layer on our Layering Page.


Layering Chart Image

Materials & Care


  • Fortius™ Air 40 92% nylon, 8% elastane
  • Coreloft™ Continuous 65 (65g/m²)
  • Permair™ 20 - 100% nylon


  • Machine wash in cold water.
  • Do not use fabric softener.
  • Tumble dry on low heat.
  • Do not iron.

Questions & Answers

Product Reviews

Available From Authorized Arc'Teryx Dealers
Midweight air-permeable insulation that self-regulates to prevent overheating.
Proton LT Vest

Proton LT Vest Men's

Midweight air-permeable insulation that self-regulates to prevent overheating.



USD $ 199.00