Gear Up with Earth's Best Merino Wool Hunting Base Layer - Where Innovation Meets Field-Proven Performance

Engineered to deliver the world’s most advanced thermal regulation system: Bamboo fiber rapidly absorbs moisture faster than any other natural material, then transfers it to ultra-fine 15.5µm Australian merino wool - the pinnacle of efficient evaporation technology.

Exclusive to Hillman, 15.5µm merino wool is a signature innovation, unmatched in performance and precision.

The combination of natural bamboo fiber and the finest merino wool leverages the unique strengths of each fiber. By combining their best qualities, this technology Amplifies performance by 50% compared to base layers made solely of merino wool.

Engineered to master sweat, moisture, and climate control, this merino-bamboo hunting base layer combines the best of both worlds to keep you warm in freezing conditions and cool when the action heats up.

Naturally odor-resistant, thanks to the antibacterial properties of merino wool, bamboo viscose, and advanced anti-odor threads, it ensures you stay fresh even during the most demanding hunts.

Versatile and technically advanced, it’s designed to function as:

The ultimate base layer or next to skin hunting underwear.
A lightweight outer bamboo-merino wool hunting t-shirt in warmer weather.

Perfect for thermoregulation in a range of conditions:

5°C (41°F) to 15°C (59°F): Ideal as an outer layer or used over your base layer.
5°C (41°F) down to -30°C (-22°F): Works seamlessly paired with additional layers.

Part of Hillman’s 6-Layer System: For maximum efficiency, pair this base layer with Hillman’s 6-Level Layering System, the most advanced layering technology for hunting. Learn more here.

Dominate the hunt with SYNERTECH™ Hunting Base Layer - Bamboo-Merino All-Season Technology - Engineered to Master Heat, Cold, and Everything Between

We craft our gear using the finest Australian merino wool yarns, expertly woven with 100% natural bamboo fibers through advanced interlock technology. The result? A second-skin layer designed for ultimate comfort and peak performance. This isn’t just thermal underwear, it’s your ultimate defense against the elements, unrivaled in the hunting world.

Seam-free underarm and shoulder areas provide maximum mobility while eliminating spaces where bacteria and odor can linger. Combined with antibacterial and anti-odor threads, this base layer keeps you fresh no matter how intense the hunt gets.

The built-in semi-glove feature shields your hands from the cold, while the ergonomic cut ensures a flawless fit. A deep front zipper allows you to adjust ventilation on the fly, and the laser-cut phone pocket keeps your essentials secure. Every detail, from the premium YKK zippers to the precision flatlock stitching, is built to withstand the toughest conditions.

For those who refuse to settle for less, Hillman delivers. The Merino-Bamboo Long Sleeve Thermal T-shirt combines world-class fabrics with cutting-edge functionality, redefining what’s possible in the hunting industry. It’s guaranteed to outperform anything else on the market.

Now it's your turn to favor your body in the best way,

we guarantee there's no alternative. If for any reason

you don't like it - send it back, no questions asked!

⚙️ Synertech® – the ultimate synergy for moisture control and thermoregulation. Bamboo absorbs, and merino wool evaporates. Together, these 100% natural fibers deliver unmatched, exponentially enhanced performance.
⚙️ Next-to-skin 100% bamboo fiber fabric – absorbs moisture better than any other material on Earth.
⚙️ Exterior of 15.5µm Australian merino wool – the most effective fiber for moisture evaporation and thermoregulation.
⚙️ Keeps you cool in summer and warm in winter.
⚙️ Anti-bacterial, self-cleaning Smart Fabric.
⚙️ CoatsProtect® – antibacterial, anti-odor threads.
⚙️ Seamless shoulders and underarms.
⚙️ Naturally adapts to body shape ergonomics.
⚙️ Anti-crease, 360° resilient fabric.
⚙️ Quick-drying and UV-blocking.
⚙️ Itch-free – gentle on skin and hypoallergenic.
⚙️ Semi-glove cuff with thumb opening.
⚙️ YKK automatic reverse zippers.
⚙️ 360-degree stretch for ultimate comfort.
⚙️ Laser-cut pocket with reinforced zipper.
⚙️ 3D branding.

Suitable for: men, women, and youth
Activities: Stalking, Driven Hunting, Fishing, Casual/Outdoor
Layer: Base layer [2BL] or Underwear layer [1UL]
Fit: Precision fit - sized to fit over underwear.
Thermal range: from 10°C (60°F) to 20°C (77°F) as an outer layer over the base layer
from 5°C (41°F) down to -30°C (-22°F) as mid-layer in combination with other layers
Weight: 360 g (Size EU52)
Composition: 48% Merino Wool, 34% Natural Bamboo Viscose, 14% Organic Cotton, 4% Spandex
Care Instructions: Machine wash warm - below 90°F (30°C) with similar colors; do not use bleach or fabric softener. Tumble dry low. Dry away from direct sunlight. Iron medium except for logos.
Warranty: 2-year Warranty - Guaranteed against manufacturing defects.

Key technologies and functionality:

The Hillman 2BL Merino Wool Base Layer-Hunting Long Sleeve Thermal T-shirt features a merino wool exterior for natural thermal regulation, seamless shoulders, ventilation zipper, anti-bacterial properties, anti-chafe stitching, and moisture management—ideal as a hunting baselayer.

A person in a brown jacket and gloves, paired with a Hillman 2BL Merino Wool Base Layer T-shirt, sits outdoors. They wear a helmet with goggles and sport a beard, thoughtfully gazing as blurred dark structures form the backdrop.

Two images feature a man in a Hillman 2BL Merino Wool Base Layer-Hunting Long Sleeve Thermal T-shirt. In the first, he holds a rifle and faces away; in the second, hes adjusting his top while checking his watch, highlighting its Synertech™ comfort and thermal regulation.

How did we create the most thermally efficient base layer on Earth?

Defined the 6 Goals:

To develop the world's most efficient natural moisture management technology.
To make a textile that absorbs and wicks moisture from the skin better than any other.
To create chemical-free odor-elimination and antibacterial fabric for hunting.
Design the coziest natural fiber clothing, crafted to be gentle, even on baby skin.
Maximize thermal insulation by using the finest yarns, which trap significantly more air than the thicker yarns used by our competitors.
To deliver a durable, long-lasting material you can trust.

SYNERTECH All-Season System - Engineered to Master Heat, Cold, and Everything Between

The synergistic technology developed by Hillman combines the best functionalities of two or more materials, achieving exponentially higher results than each material used separately. For example, we use bamboo fiber as the most efficient moisture absorber and merino wool as the most efficient wicking fiber.
In comparison, we can't reach such a high efficiency level for moisture absorption and wick by using the materials separately.

What happens if the clothing is made only of Merino wool?

Even when we use its best quality of 15.5 microns, the Merino wool structure is coarse and can only absorb 30% of its weight in moisture. Nevertheless, it stands out as the most effective moisture-wicking material on Earth.

Practically, if you wear Merino wool, it will effectively manage moderate sweating but may struggle to absorb excessive moisture from your skin, resulting in a wet and sticky feeling on top of your skin. For example, it won't absorb moisture when you are actively running or walking, and you will develop underarm sweat on your skin that takes a longer time to be absorbed.

Furthermore, merino will cause itching on sensitive skin, irrespective of its quality, grade, and origin.

What happens if the clothing is made only of Bamboo viscose?

Bamboo viscose is a natural antibacterial hollow fiber that absorbs moisture three times its weight, three times faster than cotton, and ten times better than wool. It can wick moisture faster than cotton but is less efficient than wool.

odor elimination hunting anti-odor baslayer

For example, bamboo will absorb your sweat much quicker than any other material, but you will still develop sweat spots, which will be fewer than cotton but still exist.
Also, bamboo fiber provides a silk-like, gentle feeling when in contact with the skin. It also allows heavy brushing for superior air trapping, better insolation, and a gentle fleecy feel.

The Final Result

Using natural chemical-free bamboo fiber as the best moisture absorber and the World’s finest possible grade 15.5-micron Australian merino wool as the best moisture-wicking layer, we have exponentially higher moisture management and thermoregulation efficiency than any other material on Earth. By using the finest grades of materials, the gentle and cozy, itch-free, super functional fabric is now a reality. The plus is that both fibers are naturally antibacterial and anti-odor, making them the best synergy of natural fibers for hunting clothing ever.

COATS PROTECT

the power of anti-odor and anti-bacterial threads

Even if the material is antibacterial, the odor buildup in the underarm threads will always occur if the threads are not treated. This is why we used the one-of-a-kind CoatsProtect® threads to sew our hoodie and achieve the maximum level of odor elimination.

The Hillman 2BL Merino Wool Base Layer-Hunting Long Sleeve Thermal T-shirt features a blue circular logo with COATS in white capital letters under a stylized chain link, showcasing Synertech™ technology for advanced thermal regulation.

With anti-microbe treatment
(Zone of inhibition clearly seen)

Two round petri dishes on a purple background contain white, coiled objects resembling string or yarn, showcasing the intricate design reminiscent of Hillmans SYNERTECH™ technology in the 2BL Merino Wool Base Layer - Hunting Long Sleeve Thermal T-shirt.

Two round petri dishes on a purple background contain white, coiled objects resembling string or yarn, showcasing the intricate design reminiscent of Hillmans SYNERTECH™ technology in the 2BL Merino Wool Base Layer - Hunting Long Sleeve Thermal T-shirt.

Without treatment
(No zone of inhibition)

Two circular glass petri dishes on a purple background hold objects resembling Hillmans 2BL Merino Wool Base Layer Long Sleeve T-shirt with Synertech™ technology, symbolizing innovative thermal regulation in miniature form.

Two circular glass petri dishes on a purple background hold objects resembling Hillmans 2BL Merino Wool Base Layer Long Sleeve T-shirt with Synertech™ technology, symbolizing innovative thermal regulation in miniature form.

Designed with seamless shoulder yokes, the hoodie will bring extra comfort when carrying a backpack or rifle.

It doesn’t matter if you will wear this hoodie for hunting, hiking, or your daily life; we guarantee top performance, the highest level of comfort, and superb odor control.

Now get the best and most efficient premium hunting baselayer built with the finest materials on Earth that will bring a new level of perfection and definitely enhance your comfort and hunting efficiency.

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GET INTO THE SCIENCE OF MERINO WOOL - THE FIBER THAT’S WORTH IT

Before we made our own, we used to buy all other products out there, all the while wanting different, better clothes to keep us warm in winter and cool in summer. But we still got cold, wet or clammy, not to mention that we’d stink more often than not. After years of research, we were led to an old favorite of our grandparents: wool. It helped keep us warm all winter and remarkably cool in the summer, without the stink. However, that wool wasn’t very comfortable. Then we discovered Merino wool and our world was changed forever.

A split image: left, sheep graze in a frosty winter landscape; right, they enjoy a warm autumn field. See how natures thermal regulation rivals Hillmans Synertech™ 2BL Merino Wool Base Layer-Hunting Long Sleeve Thermal T-shirt technology.

A graphic titled The 12 Functions That Make Merino Wool the Earths Best Fiber highlights Hillmans 2BL Merino Wool Base Layer-Hunting Long Sleeve Thermal T-shirts features: thermal regulation, odor resistance, moisture absorption, quick drying, SYNERTECH™ technology, and SPF protection.

THE KEY FACTORS OF QUALITY AND HOW TO BE ADEPT WHEN BUYING

Merino wool is able to ditch the itch thanks to its fiber’s smaller diameter. The finer fibers are more flexible and softly bend when pressed against the skin, and therefore don’t itch like other wool fabrics. These also enhance the wool’s elastic nature, making garments made with Merino wool more able to conform to the body shape they’re on, enhancing the garment’s performance and the wearer’s comfort.

How we invented the world’s best Merino layers ever made for hunting

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USING THE FINEST WOOL THE WORLD HAS TO OFFER
Our Merino products are the finest that current technology allows. Why do we say technology? Because the superfine 15.5 mictorns merino fibers are extremely difficult to master, we needed novel methods to keep the fibers stable like they are in blends. Hillman’s Merino fiber is so fine, with a gentle cotton-like touch, instantly offering much greater comfort, far higher functionality, and efficiency for thermal insulation than any other Merino available today.

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CREATING A FLAWLESS BODY MAP SYSTEM
Imagine having an exceptionally warm layer of Merino, and now imagine it doubling under your arms as soon as you retract them to your body. Yes, more Merino doesn’t always make for better comfort, or at least not in this case. The same happens with your thigh area. What about the pant cuffs? Imagine always having to squash them into your boots... Now, do you get what body-mapping is? With the help of our BodyMap technology, you will be equipped with heavier fabric in areas where extra warmth is needed and with a lighter one where mobility is essential. Don’t worry; we also thought about your pant cuffs, which we thoughtfully designed with a break above the shoe area.

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IMPLEMENTING TECHNOLOGIES FOR COMFORT
In order to create our clothing versatile, valuable and true to its purpose, we implemented various technologies throughout the process. From flat seams, thumb holes, pockets, and others to superb seamless sewing, stretch zippers, and heating system integration, it’s a process that we’ve been developing for years. Today, we can, without a doubt, declare that our Merino layers will bring you new levels of comfort, functionality, and satisfaction since they’re invented exclusively with you in mind.

Best Merino Wool Hunting Clothes, Jackets, Tops, Base Layers

3ML Hunting Hoodie - Warmest Merino Wool Mid Layer | Synertech™

Ultrawarm merino hunting socks [HC]

[16μm] Anatomic Merino Beanie

2BL Merino Wool Base Layer-Hunting Long Sleeve Thermal T-shirt