Ultralight insulation for serious mountain days

The Mountain Equipment Men's Oreus Vest combines PLASMA 10D outer fabric with innovative Aetherm™ synthetic insulation to deliver exceptional warmth, breathability and packability for demanding mountain use. Designed for climbers, mountaineers, ski tourers and hill walkers, it performs equally well as an outer layer, insulating mid-layer or emergency warmth layer carried in a pack. No verified temperature rating or weather threshold has been supplied.

Performance & Engineering

• Aetherm™ Precision Insulation. Engineered with groundbreaking Aetherm™ synthetic insulation that integrates fibre technology with heat-reflective fabric technology to deliver outstanding warmth for its weight, making it ideal for cold alpine starts and high-mountain objectives.

• PLASMA 10D Outer Fabric. Built with PLASMA 10D fabric that provides exceptional lightweight performance and breathability, helping regulate comfort during high-output pursuits such as ski touring and alpine climbing.

• Weather-Resistant Protection. Designed with a durable water-repellent (DWR) finish that sheds light rain and snow, helping maintain loft and comfort in mixed mountain conditions.

• Technical Layering Capability. Engineered with a 2-way YKK® Vislon® centre front zip and insulated baffle that minimise cold spots while allowing ventilation and easy integration with climbing harnesses and layering systems.

• Packable Mountain Functionality. Built with multiple storage options and a design that packs into its own internal pocket with twin carabiner carry loops, making it easy to carry on a harness or store inside a pack when not needed.

Technical Specifications

• Ideal For: Alpine Climbing, Mountaineering, Mountain Walking & Trekking
• Main Fabric: PLASMA 10D outer fabric with DWR finish; Aetherm™ synthetic insulation
• Weight: 200g / 7.1oz
• Hardware: 2-way YKK® Vislon® centre front zip with insulated baffle
• Pockets / Features: 2 zipped hand-warmer pockets, 1 zipped chest pocket, pleated internal drop pocket, dual-tether hem drawcords, packs into internal pocket with twin carabiner carry loops
• Fit: Not specified

Care & Longevity

Machine wash at 30°C using liquid detergent or a specialist cleaner. Tumble dry on a cool setting and store in a cool, dry place away from direct sunlight to help maintain insulation loft and long-term performance. Avoid high-heat drying and always follow the manufacturer's care instructions.