Premium 100% Natural Fiber Blend for Technical Thermo-Regulation and Next-to-Skin Softness

The Mammut Women's Tree Wool FL T-Shirt is a highly technical, multi-sport performance top engineered to deliver exceptional climate comfort during high-output alpine hiking, vertical climbing, and demanding backcountry ski tours. Meticulously constructed from an entirely natural blend of premium merino wool and Lyocell—a biodegradable fiber sourced from sustainably managed wood—this versatile tee provides a silky-soft feel that eliminates the itch often associated with traditional wool garments. This innovative fabric matrix leverages the strengths of both fibers to actively optimize your body’s microclimate, offering reliable warmth when conditions cool down and high breathability when your heart rate spikes.

Designed to handle intense back-to-back trail days, the technical fabric naturally resists odor-causing bacteria to keep you feeling fresh without relying on synthetic chemical treatments. This natural blend pulls sweat rapidly away from the skin and dries significantly faster than pure wool tops, preventing cold drafts after heavy exertion. The shirt is patterned with a comfortable, relaxed cut and features functional underarm gussets to allow completely uninhibited shoulder mobility during overhead climbing reaches or pole plants. Finished with ethically sourced, RWS-certified merino wool to ensure animal welfare, this light and packable top transitions seamlessly from technical mountain terrain to casual everyday wear.

Key Features:

• 100% Natural Fiber Hybrid: High-performance blend of merino wool and Lyocell wood fibers provides mechanical stretch, durability, and a soft touch.
• Accelerated Drying Profile: Engineered knit matrix disperses moisture rapidly, allowing it to dry much faster than standard 100% wool garments.
• Natural Odor Control: Inherently antimicrobial merino fibers prevent the buildup of bacteria, keeping the shirt fresh through multi-day trips.
• Ergonomic Underarm Gussets: Specialized side-panel tailoring ensures a complete range of motion and stops the hem from riding up while climbing.
• Dynamic Temperature Regulation: Smart natural fibers adapt to your activity level, cooling the body via evaporation or trapping ambient core warmth.
• Responsible Wool Standard (RWS): Built utilizing certified wool yarns to verify strict animal welfare and sustainable land management practices.
• Chafe-Free Flat Seams: Low-profile stitching lines across high-movement zones eliminate next-to-skin irritation underneath backpack shoulder straps.