Unisex Wool Thermo Light Longs Base Layer

Brynje USA

Wool Thermo Light Longs Base Layer

$109.95 USD

4.7

Built to keep you dry, warm, and moving through cold, high-output conditions.

Color: Black

Quantity:

Brynje USA Wool Thermo Light Longs Base Layer

$109.95 USD

Lightweight Merino comfort with airflow built into every layer.

Wool Thermo Light uses soft, superfine Merino in a finer mesh that feels lighter and looks more conventional than Brynje’s larger-cell wool mesh. It balances warmth, airflow, and natural odor control for daily wear, shoulder-season conditions, and active use where there is less risk of extreme cold.

Best For

Daily Wear

Hiking & Travel

Skiing & Snowboarding

Shoulder Seasons

Cool-Weather Work

Multi-Day Wear

Layer Type Next-to-skin fine Merino mesh base layer

Gender Unisex

Fabric Weight 160 g/m²

Weight Varies by garment and size

Fit Notes Slim, next-to-skin fit. Fine mesh stretches to shape, and Brynje garments are generally cut long.

Specific Measurements Measurements vary by garment and size. See the size chart for product-specific measurements.

Construction Fine Merino micro-mesh with a more conventional appearance than larger-cell Wool Thermo. Solid-knit panels, collars, and inlays vary by garment.

Product Features Product-specific features vary by garment and may include different sleeve lengths, necklines, collars, solid-knit panels, inlays, and coverage.

Origin Made in Poland

Material 80% Merino / 20% polyamide

Merino Fiber 17.5 micron superfine Merino

Reinforcement Polyamide reinforcement improves durability and shape retention

Washing Wool cycle, maximum 85°F / 30°C

Drying Reshape and line dry. Do not tumble dry.

Care Notes Wash on a wool cycle with wool-specific detergent. Do not use fabric softener. Reshape and line dry.

Fewer Washes Merino odor resistance supports airing between wears

Durability Reinforced fine-mesh blend supports everyday wear and repeated use

Repairability Small damage can often be repaired to extend use

Natural Fiber Content 80% superfine, 17.5-micron Merino wool

Made In Poland

Use Philosophy Wear longer, wash less, repair when possible

Suggested Active-Use Starting Window

35°F to 60°F

2°C to 16°C

A practical starting window for daily wear and medium-output activity in cool to moderate conditions. Wool Thermo Light is designed for spring, summer, and fall use, or colder conditions beneath a complete layering system. For sustained high exertion or greater moisture transport, Super Thermo may be the better next-to-skin choice.

Cool Conditions Mild / Moderate

0°F -18°C

35°F 2°C

60°F 16°C

70°F 21°C

Temperature windows are approximate, not safety ratings. Wool Thermo Light is best selected by activity level and the complete layering system. Comfort varies with metabolism, pace, wind, humidity, precipitation, altitude, and duration.

Find Your Perfect Fit

1. Select Garment Category

2. Select Fit Preference

3. Dial In Your Measurements

Your Recommended Size

MD Optimal Match

Why Fine Merino Mesh Works

Wool Thermo Light uses a finer Merino mesh to create airflow and insulating space with a smoother, more conventional appearance. The smaller cells reduce fabric contact with the skin, move excess heat and moisture outward, and hold warm air when activity slows.

Brynje Wool Thermo Light fine Merino mesh layering diagram

That Means:

Lighter, finer mesh with a more conventional look

Balanced warmth and airflow across changing effort

Merino odor control for daily and multi-day wear

Less moisture pickup than conventional solid-knit wool

Performance Layering Mechanics

Toggle between the modes below to see how the mesh manages moisture and warmth.

SYSTEM KEY

Water Vapor / Sweat

Body Heat

SKIN

OUTER LAYER

Next-To-Skin Only: Open mesh cells dump excess heat while channeling moisture vapor away from your skin.

+ CHAPTER 05 / COMMITMENT We don't do seasons. We don't do trends.

We make garments that last.

Repairable

Designed with construction methods that allow for easy repairs, extending the life of your gear for decades.

Timeless

Our aesthetic hasn't changed much since 1953. We focus on function over fashion cycles.

Tested

Every stitch is proven in the world's harshest environments before it ever reaches your back.