The Aconcagua Midlayer Jacket from Mammut is a men’s full-zip stretch fleece designed to add a layer of breathable warmth during outdoor pursuits. It sits close to the body as a slim-fit midlayer, making it a versatile piece for everything from hiking to campsite chores.
Constructed from a blend of 52% polyester, 39% polyamide and 9% elastane, this fleece vest uses Polartec® Power Stretch® Pro™ technology to marry softness with durability. The result is a fabric that moves with you, retains warmth when you pause, and dries more quickly than standard fleeces. Its slim profile means it tucks neatly under a shell or worn on its own in milder conditions, while the full-length zipper and stretchy material help regulate temperature on the go. Environmental credentials like Bluesign® approval and Fair Wear certification also speak to Mammut’s focus on responsible production.
Polartec® Power Stretch® Pro™ is a two-layer knit: a tough outer face resists abrasion and wind, while a plush inner layer wicks moisture and traps heat close to the body. This construction delivers balanced warmth and breathability, reducing sweat buildup and helping you stay comfortable across changing activity levels.
Click to read the product description by Mammut
Mammut says about theAconcagua Midlayer Jacket
The Aconcagua is a classic fleece jacket for sporty lifestyles. Now in its third generation, it still holds its own on expeditions, long and short outdoor adventures and is also suitable for everyday wear. The Polartec® Power Stretch® Pro material is comfortable and ensures you can always move freely thanks to its flexible 4-way stretch material. The fleece fabric keeps you warm, efficiently wicks away moisture and dries quickly. The Aconcagua has a tight fit, making it your go-to mid-layer for wearing under a hardshell layer. Its tried and tested features and timeless design also make the jacket perfect for wearing on its own when hiking, climbing or just enjoying your free time. The Aconcagua is made to offer superior quality, is extremely rugged and always keeps its shape.
Product specifications
| Material | 52% polyester, 39% polyamide, 9% elastane |
|---|---|
| Other specifications | Raglan sleeves, 4-way stretch, moisture wicking, quick drying |
| Environmental information | Bluesign®, fair wear |
| Fit | Slim fit |
| Technology/construction | Polartec® power stretch® pro™ |
| Weight | 367 gr |
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