Ultralight insulation for exposed alpine objectives

The Mountain Equipment Frostline Jacket is a minimalist technical down jacket built with DRILITE® Loft 20D fabric and 136g (Size L) of 90/10 700 fill power Pure Down for lightweight warmth and dependable weather resistance. Designed for alpinists, ski tourers and trekkers, it delivers essential insulation in exposed mountain terrain while maintaining a compact pack size for fast-moving adventures. The protective Mountain HC Hood and weather-resistant shell make it a versatile layering piece when conditions become challenging.

Performance & Engineering

• Premium Down Warmth
  Engineered with 136g (Size L) of 90/10 Pure Down with 700 fill power, delivering excellent warmth-to-weight performance for alpine climbing, ski touring and lightweight mountain travel.

• Weather-Resistant DRILITE® Loft Shell
  Built with DRILITE® Loft 20D outer fabric, providing total windproof protection and high water resistance to help maintain insulation performance during light precipitation and exposed conditions.

• Low-Bulk Baffle Construction
  Designed with stitched-through narrow baffle construction throughout to minimise weight and pack size while maintaining even insulation distribution.

• Protective Mountain HC Hood
  Engineered with an adjustable elastane-bound Mountain HC Hood, providing secure coverage and additional protection when moving through windy ridgelines and exposed mountain terrain.

• Packable Mountain Utility
  Built to pack into a hand pocket and equipped with twin karabiner carry loops, allowing convenient storage and attachment to climbing packs or harness systems when not in use.

Technical Specifications

• Ideal For: Alpine Climbing, Ski Touring
• Main Fabric: DRILITE® Loft 20D outer fabric; 100% Polyamide outer and inner; 136g (Size L) of 90/10 700 fill power Pure Down
• Weight: 410g / 14.5oz
• Hardware: 2-way YKK® moulded centre front zip
• Pockets / Features: 2 zipped hand warmer pockets, Napoleon chest pocket, adjustable elastane-bound Mountain HC Hood, elastane-bound cuffs, adjustable dual-tether hem drawcords, stitched-through narrow baffle construction, packs into hand pocket with twin karabiner carry loops
• Fit: Not specified

Care & Longevity

Maintain loft and weather resistance by storing the jacket uncompressed whenever possible and keeping the shell fabric clean. Always follow the manufacturer's care label instructions for washing, drying and storage to preserve down performance and garment lifespan.