Serious insulation for extreme mountain environments

The Mountain Equipment K7 Expedition Down Jacket is a high-altitude insulation layer engineered with DRILITE® LOFT 30D outer fabric and 300g of 90/10 800 fill power goose down. Designed for expedition mountaineers, alpinists and climbers operating in harsh mountain environments, it combines box-wall construction, advanced thermal efficiency features and expedition-level weather protection for prolonged use in remote and demanding conditions. Proven on high Himalayan peaks and in polar regions, it delivers dependable warmth when reliable insulation is essential.

Performance & Engineering

• Expedition-Grade Goose Down Insulation: Engineered with 300g (Size L) of 90/10 800 fill power goose down to provide exceptional warmth with a low packed size, making it suitable for extended alpine and expedition use where weight and thermal performance are critical.

• Box-Wall Baffle Construction: Built with box-wall baffles that eliminate compression points within the insulation, delivering the highest level of thermal efficiency and warmth compared to stitched-through constructions.

• EXL Thermal Efficiency System: Incorporates the EXL system through the back of the jacket, using elasticated stitching to reduce dead air space and improve heat retention during prolonged exposure to severe conditions.

• DRILITE® LOFT Weather Protection: Utilises DRILITE® LOFT 30D fabric with a durable water-repellent (DWR) finish, providing complete windproof protection and reliable resistance against snow, spindrift and moisture.

• Expedition-Focused Protection: Combines a Super Alpine HC Hood, Halo Collar, insulated zip baffle and moisture-resistant hood, cuff and hem linings to maximise warmth and protection during high-altitude climbing and mountaineering objectives.

Technical Specifications

• Ideal For: Alpine Climbing, Mountaineering
• Main Fabric: DRILITE® LOFT 30D outer fabric with durable water-repellent (DWR) finish
• Weight: 870g / 30.7oz
• Hardware: 2-way YKK® Vislon® centre front zip with insulated baffle
• Pockets / Features: 300g 90/10 800 fill power goose down, box-wall baffle construction, EXL thermal efficiency system, Super Alpine HC Hood, Halo Collar, 2 zipped hand warmer pockets, chest pocket, 2 large internal mesh pockets, DRILITE® LOFT 30D hem/cuff/hood lining, internal elasticated cuffs, dual-tether hem drawcords
• Fit: Not specified

Care & Longevity

Hand wash or machine wash at 30°C using liquid detergent or a specialist down cleaner. Tumble dry on a low heat with a slow spin speed and store in a cool, dry place away from direct sunlight. Avoid high-temperature washing, drying and prolonged compression during storage to maintain loft, thermal performance and the DWR treatment.