Reliable insulation for demanding mountain days

The Mountain Equipment Senja Men's Down Jacket is a versatile mid-weight insulated layer built with DRILITE® LOFT 40D fabric and 220g of 90/10 duck down with a minimum 700 fill power. Designed for backpackers, mountaineers, trekkers and skiers, it delivers a balance of warmth, weather protection and packability for everything from Himalayan trekking and mountaineering to everyday use in cool or cold conditions.

Performance & Engineering

• 220g 700 Fill Power Duck Down – Engineered with 220g (size L) of 90/10 duck down and a minimum 700 fill power to provide substantial insulation whilst maintaining a compact pack size for mountain travel.
• DRILITE® LOFT 40D Protection – Built with DRILITE® LOFT 40D outer fabric that is completely windproof and highly weather-resistant, helping maintain warmth during exposed ridgelines, snowy conditions and changeable mountain weather.
• DWR-Treated Outer Fabric – Designed with a durable water-repellent (DWR) finish that sheds rain and snow, keeping the outer fabric drier for longer in mixed conditions.
• Mountain HC Hood & Insulated Collar – Engineered with an insulated Mountain HC Hood and insulated collar to provide protective coverage and helmet compatibility when required during technical mountain use.
• Mountain-Ready Comfort & Storage – Built with a 2-way YKK® Vislon® zip, two zipped hand-warmer pockets, an internal security pocket, adjustable cuffs and dual-tether hem drawcords for secure fit adjustment and reliable storage of essentials.

Technical Specifications

• Ideal For: Mountaineering, Everyday
• Main Fabric: DRILITE® LOFT 40D outer fabric; 220g 90/10 duck down insulation with minimum 700 fill power
• Weight: 580g / 1lb 4.5oz
• Hardware: 2-way YKK® Vislon® centre front zip with insulated baffle
• Pockets / Features: 2 zipped hand-warmer pockets, internal zipped security pocket, insulated Mountain HC Hood, insulated collar, stitched-through baffle construction, adjustable cuffs, dual-tether hem drawcords, DWR finish
• Fit: Regular mountain fit with room for layering; helmet-compatible hood

Care & Longevity

Hand wash or machine wash at 30°C using a specialist down cleaner, then tumble dry on a cool setting to maintain loft and performance. Store in a cool, dry place away from direct sunlight. Avoid high heat, harsh detergents and prolonged compression during storage to help preserve down insulation and weather-resistant treatments.