Expedition warmth for demanding alpine objectives

The Mountain Equipment Paiyu Down Jacket is a high-insulation mountain shell engineered with DRILITE® LOFT 40D outer fabric, 269g of 90/10 700 fill power duck down, and an advanced dual-layer offset baffle construction. Built for mountaineers, ice climbers and expedition users, it delivers exceptional warmth, weather resistance and mobility for prolonged use on high-altitude peaks, multi-day ski journeys and technical winter objectives. Its reflective thermal technology and expedition-focused feature set maximise insulation efficiency without the bulk associated with traditional box-wall constructions.

Performance & Engineering

• Dual-Layer Offset Baffle Construction: Engineered with a double-layer offset baffle design that eliminates cold spots commonly found in stitched-through down jackets, helping maintain consistent warmth during extended exposure to harsh mountain conditions.

• High-Loft Down Insulation: Built with 269g (Size L) of 90/10 700 fill power duck down, providing substantial warmth with a compressible pack size for expedition climbing and remote alpine travel.

• Reflective Thermal Technology: Utilises a reflective internal scrim that helps return body heat back towards the wearer, improving thermal efficiency when maximum warmth is required for every gram carried.

• DRILITE® LOFT Weather Protection: Designed with DRILITE® LOFT 40D outer fabric and a durable water-repellent (DWR) finish, delivering complete windproof protection and reliable resistance to snow, spindrift and winter weather.

• Expedition-Ready Storage & Protection: Combines an Insulated Mountain HC Hood, insulated collar, two chest pockets, large internal mesh pockets and a security pocket, ensuring essential equipment, gloves and water remain easily accessible and protected from freezing conditions.

Technical Specifications

• Ideal For: Mountaineering, Ice & Mixed Climbing
• Main Fabric: DRILITE® LOFT 40D outer fabric with durable water-repellent (DWR) finish
• Weight: 730g / 1lb 9.7oz
• Hardware: 2-way YKK® Vislon® centre front zip with insulated baffle
• Pockets / Features: 269g 90/10 700 fill power duck down, double-layer offset baffle construction, reflective internal scrim, Insulated Mountain HC Hood with insulated collar, 2 zipped hand warmer pockets, 2 chest pockets, internal zipped security pocket, two large internal mesh pockets, adjustable cuffs, dual-tether hem drawcords
• Fit: Not specified

Care & Longevity

Hand wash or machine wash at 30°C using a specialist down cleaner. Tumble dry on a cool setting and store in a cool, dry place away from direct sunlight to maintain loft and weather-resistant performance. Avoid standard detergents, excessive heat and long-term compression during storage to preserve insulation efficiency and the DWR treatment.