Hot Tree Wool FL Longsleeve Baselayer – Long Sleeves

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The Mammut Tree Wool FL Longsleeve blends merino wool and Lyocell for comfort, warmth, and breathability. It’s lightweight at 176 grams (medium), dries faster than traditional wool, and has temperature regulation and odor-neutralizing properties.

Mammut says: 

A true outdoor all-rounder, the Tree Wool tee is all about high performance versatility. Merino wool and Lyocell – a biodegradable fiber extracted from sustainably grown wood – deliver great performance and unrivalled comfort. The 100% natural fiber blend is breathable and fast drying, offering excellent temperature control and odor neutralization. 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, a spring ski tour or simply catching up with friends, this versatile, high-performance tee is up for the adventure.

All Mammut products purchased within the Europe come with an extended 30-month warranty period. For more details click here.

Our Verdict

The Mammut Tree Wool FL Longsleeve is a versatile and eco-conscious choice. Crafted from a blend of merino wool and Lyocell, this baselayer balances comfort and functionality.

Weighing just 176 grams for a medium, the Tree Wool Longsleeve is impressively lightweight, yet it delivers the warmth and breathability you’d expect from a quality merino blend. Including Lyocell, a fibre derived from sustainably grown wood, not only enhances the shirt’s eco-credentials but also improves its drying time, notably faster than traditional wool fabrics. This makes it ideal for multi-day treks where you need your gear to dry quickly between wears.

The merino blend’s natural temperature regulation and odor-neutralizing properties are key factors in maintaining comfort during strenuous hikes. The fabric feels soft against the skin, and the relaxed cut offers excellent freedom of movement, enhanced by the underarm gussets. 

The understated design also means this top transitions easily from the trail to more casual settings. Its laid-back style doesn’t scream ‘technical gear’, making it just as suitable for a post-hike coffee as it is for a day on the mountain.

– Reviewed by Ultralight Outdoor Gear

Features

• RWS-certified wool to protect animal welfare
• Dries faster than traditional wool fabrics
• Functional underarm gusset for optimum freedom of movement
• Responsible wool
• Fair Wear

Specifications

• Small weighs: 170g
• Medium weighs: 176g
• Large weighs: 206g
• XLarge weighs: 214g
• Cut: Regular Fit

Material & Construction

• Main Fabric 1 (B2B): Tree Wool (140g/m²)
• Main Fabric 1 – Face Material (B2B): 50% Merino Wool, 50% TENCEL™ Lyocell

Help & advice:

• The Benefits of Merino Wool
• Ethical Wool