Altitude Sports
Altitude Sports
Men's Proton LT Jacket




Men's Proton LT Jacket


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Light & Breathable.

The men's Proton LT Jacket is an exceptionally lightweight insulator that delivers air permeability and warmth during high-alpine activities. It's padded with Coreloft Continuous 65 insulation and protected with a Fortius Air 40 outer fabric. The face fabric balances wind- and- water resistance with necessary ventilation. Arc'teryx outfitted the Proton LT with a collar height that provides extended coverage. The No Slip Zip front zipper prevents self-opening during high-output activities. The hem has dual adjusters that tighten to block cold updrafts. The exterior hand pockets are insulated, and the zippered chest pocket serves as storage for your phone or map. This trim-fitting jacket weighs only 355-grams, delivering performance as a standalone or mid layer for climbing waterfalls and backcountry tours.

  • Fortius Air outer fabric
  • Coreloft Continuous 65 insulation
  • Collar height for coverage
  • Dual hem adjustments
  • One chest pockets
  • Weighs 355-grams
  • Trim-fit
  • Arc'teryx Ascent Collection


  • [exterior] Fortius™ Air 40
  • [lining] Permair™ 20
  • [body] Coreloft™ Continuous 65 (65g/m²)
Water Resistance
  • Yes
Wind Resistance
  • Yes
  • Trim, hip length
  • 2 insulated hand pockets, 1 chest pockets
  • 355g
  • Centre back length: 29.1" / 74 cm
Recommended Use

  • Alpine Skiing, Backountry Touring, Winter Trekking, Winter Activities, Snowboarding, Urban Winter Activities

Product style: arc-18355

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