Mammut Aconcagua ML jas – heren Polartec fleece midlayer (Tschiel/Blue Teal, maat L)

Alpinists and ski tourers heading into cold, high-alpine conditions need a layer that manages moisture without adding bulk. The Mammut Aconcagua ML Jacket answers with a highly breathable Polartec Power Grid fleece that sits comfortably under a shell. Its tight-knit grid structure traps warmth while the open weave promotes airflow, so you stay dry during high-output ascents and warm when the pace drops.

Key specifications

• Material: Polartec Power Grid (89% Polyester, 11% Spandex) for 4-way stretch and excellent moisture management
• Full-length YKK Vislon front zipper – durable and easy to grip with gloves
• One zippered chest pocket keeps your phone or map secure
• High stand-up collar seals in heat without restricting movement
• Raglan sleeves provide unrestricted reach for climbing and scrambling
• Elastic cuffs with integrated thumb loops keep sleeves in place under a shell
• Flatlock seams reduce chafing when wearing a pack
• UPF 50+ protection against intense alpine sun
• bluesign® PRODUCT certified – manufactured with reduced environmental impact

Why choose it

The Aconcagua ML Jacket sits at the sweet spot between insulation and breathability. The Polartec Power Grid fabric offers the warmth of a heavier fleece but with far less weight and pack volume. Its athletic fit layers neatly under any hardshell, while the stretch fabric moves with you on technical terrain. Whether you’re leading a mixed route or breaking trail on a windy ridge, this fleece delivers dependable thermal regulation.

Ideal use cases

• Mountaineering and alpine climbing
• Ski touring and backcountry skiing
• Hiking and trekking in cool conditions
• Everyday layering in cold weather

Good to know

This mid-layer is designed for active use in cold environments. The Polartec Power Grid fabric is quick-drying and highly breathable, making it an excellent choice for high-output activities. The athletic fit allows for easy layering under a shell, and the thumb loops keep sleeves in place when adding or removing layers. The bluesign® certification ensures that the jacket was produced with a reduced environmental impact.