Mammut Aconcagua Light ML Men's Fleece Jacket Black

For mountaineers who demand performance without weight, the Aconcagua Light ML stands apart with its Polartec Power Grid construction—a knit that traps warmth in key zones while aggressively moving moisture, so you stay dry during hard pushes. Unlike standard fleece, this mid-layer offers 4-way stretch for unrestricted reach on technical terrain, and a high stand-up collar adds extra protection when the wind picks up.

Highlights

• Polartec Power Grid knit for a great warmth-to-weight ratio
• 4-way stretch allows unrestricted movement during climbing or hiking
• High stand-up collar adds extra protection against the cold
• Two zippered side pockets keep essentials secure
• Thumb loops prevent the sleeves from riding up
• bluesign® PRODUCT ensures environmentally responsible manufacturing

In daily use

The Aconcagua Light ML is designed to be worn as a mid-layer under a hardshell or as a standalone piece on cool, dry days. Its athletic fit and stretchy fabric follow your every move, while the UPF 30+ protection makes it versatile for exposed ridges. The Polartec Power Grid material efficiently wicks moisture away from the skin, keeping you dry even when the pace picks up.

Full specifications

• Material Technology: Polartec Power Grid
• Material Composition: 92% Polyester, 8% Spandex
• Fit: Athletic Fit
• Pockets: 2 zippered side pockets
• Closure Type: Full-length front zipper
• Collar Type: High stand-up collar
• Sleeve Features: Long sleeves with thumb loops
• Stretch: 4-way stretch
• Breathability: High
• Moisture Wicking: Yes
• Sustainability: bluesign® PRODUCT
• Intended Use: Mountaineering, Hiking, Ski Touring, Climbing, Trekking
• Gender: Men's
• Season: All-season
• Layering: Mid-layer
• UV Protection: UPF 30+
• Product Line: Aconcagua Light
• Color: Black

Final note

From alpine starts to exposed scrambles, this fleece delivers the breathable warmth and freedom of movement serious mountain days demand—without unnecessary bulk.