Sustainable All-Season Performance in a 100% Natural Knit

The Mammut Men’s Tree Wool FL Longsleeve is a high-performance mountain staple designed for those who demand the best from natural fibers. This versatile longsleeve utilizes a 100% natural fiber blend of premium RWS-certified Merino wool and Lyocell—a biodegradable fiber sourced from sustainably grown wood. This unique "Tree Wool" construction offers a silk-like feel against the skin, providing superior cooling and moisture transport compared to pure wool, while retaining the essential warmth and thermal regulation required for high-altitude adventures.

Whether used as a moisture-wicking base layer for spring ski tours or a protective standalone piece for high-mileage summer hikes, the Tree Wool FL excels at natural odor neutralization and rapid drying. The relaxed athletic cut is specifically patterned to ensure total freedom of movement during technical climbs or scrambles. With its commitment to biodegradable materials and ethical wool standards, this longsleeve is the definitive choice for the eco-conscious athlete who refuses to compromise on technical capability.

Key Features:

• 100% Natural Hybrid Fabric: Blends RWS-certified Merino wool with wood-derived Lyocell for a high-performance, biodegradable textile.
• Extended Multi-Season Coverage: Longsleeve design provides extra warmth for cool mornings and sun protection for high-exposure days.
• Natural Cooling & Breathability: Lyocell fibers provide a smooth, cooling sensation and elite moisture-wicking performance.
• Odor Resistant: Natural anti-microbial properties of Merino wool keep the garment fresh over multiple days of use.
• Fast-Drying Performance: Engineered to move perspiration away from the skin and evaporate quickly to prevent chilling.
• Optimized Mobility: Relaxed cut and ergonomic seams provide unrestricted movement for climbing and trekking.
• Soft & Chafe-Free: The unique fiber blend is exceptionally soft, making it ideal for those with sensitive skin who find pure wool irritating.
• Sustainable & Ethical: Features Responsible Wool Standard-certified wool and sustainably sourced botanical fibers.