Unisex Wool Thermo Longs Base Layer with Inlay image 0
Brynje USA

Wool Thermo Longs Base Layer with Inlay

Sale price$119.95 USD4.8

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

Color: Black
Size: XXXL

Merino warmth and odor control, built into Brynje’s open-mesh system.

Wool Thermo combines Brynje’s 3/8-inch open mesh with soft, superfine Merino wool. The mesh creates insulating air space while reducing the amount of damp fabric touching the skin. Merino adds warmth when damp and natural odor control, making this collection especially useful for cold conditions, mixed-output activity, and multi-day wear.

Best For
Cold-Weather Hiking
Backpacking
Skiing
Hunting
Fishing
Multi-Day Use
Layer Type Next-to-skin Merino mesh base layer
Gender Unisex
Fabric Weight 125 g/m²
Weight Varies by garment and size
Fit Notes Slim, next-to-skin fit. The mesh stretches in width and Brynje garments are generally cut long.
Specific Measurements Measurements vary by garment and size. See the size chart for product-specific measurements.
Construction Classic 3/8-inch open Merino mesh. Product-specific solid-knit panels or 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 extended coverage.
Origin Made in Poland
Material 80% Merino / 20% polyamide
Merino Fiber 17.5 micron superfine Merino
Reinforcement Polyamide added for 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 blend improves wear life over delicate all-wool mesh
Repairability Small damage can often be repaired to extend use
Natural Fiber Content 80% superfine Merino wool
Made In Poland
Use Philosophy Wear longer, wash less, repair when possible
Suggested Active-Use Starting Window

15°F to 45°F

-9°C to 7°C

A practical starting window for active cold-weather use in a complete layering system. Wool Thermo is especially useful when comfort, warmth, and multi-day odor control matter. For sustained high-intensity output, Super Thermo may be the better next-to-skin choice.

Extreme Cold Mild / Moderate
-20°F -29°C
15°F -9°C
45°F 7°C
60°F 16°C

Temperature windows are approximate, not safety ratings. Comfort varies with metabolism, pace, wind, humidity, precipitation, altitude, duration, and every layer worn above the garment.

Find Your Perfect Fit

1. Select Garment Category
2. Select Fit Preference
3. Dial In Your Measurements
Your Recommended Size
MD Optimal Match

Why Merino Mesh Works

Wool Thermo combines the insulating air space of Brynje’s open mesh with the comfort and odor control of superfine Merino. The large openings reduce total fabric contact with the skin, while the wool fibers continue to provide warmth and comfort when conditions or effort levels change.

Brynje open-mesh layering and moisture-management diagram
That Means:
Insulating air pockets with less fabric touching skin
Warmth and comfort even when the wool is damp
Natural odor control for longer trips and repeated wear
Less moisture absorption 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.

Customers are saying

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+ 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.