Ultralight warmth for demanding alpine objectives

The Mountain Equipment Oreus Vest is a highly versatile insulated layer built around groundbreaking Aetherm™ synthetic insulation and an ultralight PLASMA 10D outer fabric. Designed for climbers, mountaineers, ski tourers and hill walkers, it delivers exceptional warmth-to-weight performance, fast-drying reliability and compact packability for use as an outer layer, a warm mid-layer or an over-layer in challenging mountain conditions. No verified temperature rating or weather threshold has been supplied.

Performance & Engineering

• Aetherm™ Precision Insulation: Engineered with Aetherm™ synthetic insulation that combines fibre technology with heat-reflective fabric technology to deliver an exceptional warmth-to-weight ratio, high loft and impressive packability for demanding alpine and mountain use.

• Ultralight PLASMA 10D Construction: Built with PLASMA 10D outer fabric that balances extremely low weight with high breathability, helping regulate comfort during high-output activities such as ski touring, alpine climbing and fast-moving mountain days.

• Weather-Resistant DWR Protection: Designed with a durable water-repellent (DWR) finish that sheds rain and snow, helping maintain warmth and comfort when conditions become mixed or unsettled.

• Layering & Harness Compatibility: Engineered with a 2-way YKK® Vislon® centre front zip and insulated baffle to minimise heat loss while allowing improved ventilation and accessibility when moving through technical terrain or wearing climbing equipment.

• Packable Mountain Utility: Built with a chest pocket, hand-warmer pockets, pleated internal drop pocket and a design that packs into its own internal pocket with twin carabiner carry loops, making it easy to stow in a pack or attach to a harness when not in use.

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, then tumble dry on a cool setting. Store in a cool, dry place away from direct sunlight to help maintain loft, insulation performance and the effectiveness of the DWR treatment over time. Avoid excessive heat during drying and always follow the manufacturer’s care guidance.