Discover Mammut Tree Wool Shirts: Eco-Friendly Comfort for Every Adventure
Made from tree-sourced fibers and merino wool, this breathable, moisture-wicking shirt is a sustainable choice for outdoor and everyday wear.
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Thick pine forest on a mountain with clouds hovering around them. Photo by Michael Purin.
Mammut continues to push boundaries in sustainable outdoor apparel with its new Tree Wool line of shirts. Designed for adventurers who prioritize both comfort and eco-conscious materials, these shirts blend TENCEL™ Lyocell fibers from wood pulp with merino wool, creating a fabric that delivers exceptional softness, moisture management, and temperature regulation.
The Blend That Works for Every Adventure
Girl facing the camera wearing the Mammut Tree Wool short-sleeve shirt in Marine Melange. Photo from mammut.com.
Tree Wool shirts are crafted from a mix of TENCEL™ Lyocell and responsibly sourced merino wool. This combination enhances breathability while maintaining the natural odor resistance and moisture-wicking properties of merino. Whether you're layering up for a high-altitude trek, looking for a lightweight base layer for travel, or need a breathable option for summer hikes, this fabric keeps you comfortable in changing conditions.
Rooted in Sustainability
Why tree pulp? In Mammut’s Tree Wool shirts, TENCEL™ Lyocell is derived from sustainably harvested tree pulp using a closed-loop system that recycles water and solvents, making it a more eco-friendly alternative to synthetic fabrics. Trees grow abundantly, making them a renewable resource for fiber production. Compared to synthetic fabrics, which rely on fossil fuels, tree-based fibers offer a biodegradable and low-impact alternative without compromising performance.
TENCEL™ Lyocell fibers used in Mammut's Tree Wool shirts are derived from sustainably managed forests that include tree varieties such as beech, spruce, birch, aspen, pine, and eucalyptus. These trees are carefully selected to ensure responsible sourcing and minimal environmental impact.
TENCEL™ Lyocell is made by breaking down sustainably harvested wood pulp and transforming it into fiber using a closed-loop system that recycles water and solvents.
Mammut’s commitment to responsible production is evident in the Tree Wool line. TENCEL™ is derived from sustainably managed forests and processed using an environmentally friendly closed-loop system that recycles nearly all water and solvents. Paired with non-mulesed merino wool, this makes the shirts a low-impact alternative to conventional performance wear while ensuring long-lasting durability.
Adventure-Ready Comfort
Tree Wool shirts are available in short-sleeve and long-sleeve options, making them a great choice for spring and summer adventures. The relaxed cut is optimized for excellent freedom of movement and offers a laid-back style when you’re off the mountain. Whether you’re heading out for a hike, a session at the crag, or simply catching up with friends, this versatile, high-performance tee is up for the adventure.
Shop Mammut Tree Wool Shirts
Mammut Tree Wool Short-Sleeve Shirt – A breathable, lightweight option for warm-weather adventures or as a comfortable base layer.
Women’s short sleeve in Silver sage melange. Photo by mammut.com
For women:
Price: $49
Sizes: XS - XL
Color Options: Silver Sage Melange, Marine Melange, Lavandin Melange, Peach Melange
For men:
Price: $49
Sizes: S - XXL
Color Options: Silver Sage Melange, Marine Melange, Glacier Blue Melange
Mammut Tree Wool Long-Sleeve Shirt – Ideal for cooler conditions, offering extra warmth without sacrificing breathability.
Men’s long sleeve in Glacier blue melange. Photo mammut.com
For women:
Price: $79
Sizes: XS - XL (Women),
Color Options: Marine melange, Black, Lavandin melange, Peach melange
For men:
Price: $79
Sizes: S - XXL (Men)
Color Options: Silver Sage Melange, Marine Melange, Glacier Blue Melange
Pros & Cons of Mammut Tree Wool Shirts
Pros
Soft & Breathable: The TENCEL™-merino blend provides an ultra-soft feel against the skin while enhancing airflow.
Moisture-Wicking & Odor Resistant: Keeps you dry and fresh, even on extended trips.
Eco-Friendly Materials: Sustainable sourcing and responsible production reduce environmental impact.
Temperature Regulation: Keeps you comfortable in varying climates.
Versatile Design: Functional for outdoor performance, travel, and everyday wear.
Cons
Not Ideal for Winter Activities: Best suited for spring and summer use rather than cold-weather adventures.
Higher Price Point: Premium materials and sustainability come at a higher cost.
Delicate Care Required: Merino and TENCEL™ blends need gentle washing and air drying to maintain longevity.
Why I Like Mammut’s Tree Wool Shirts
Mammut’s Tree Wool line is a great pick if you want gear that performs well and is made with sustainability in mind. Whether you're heading out for a hike, a climbing session, or just need a comfortable go-to shirt for everyday wear, these shirts deliver on breathability, comfort, and eco-friendly materials. If you're looking to add a responsibly made, high-quality piece to your outdoor wardrobe, this one’s worth considering.
