When you're out in nature’s harshest elements, staying warm and dry isn’t a luxury—it’s a necessity. But finding a layering system that is up to 22 times more effective than any other is the advantage you get only with Hillman!

Mastering the Layers

A layering system is the smartest way to make your clothing work most efficiently. With layering, you can not only build combinations suited to your preferred temperature but also remove layers if it warms up later in the day.

Mastering the layering system is simple. Once you understand it, you’ll never go back to heavy, insulated clothing that can easily overheat you or leave you cold due to its lack of versatility.

Use the layers in different combinations to achieve optimal comfort in the temperatures and weather conditions you’ll be hunting in. Refer to this table to learn how to combine layers for various conditions.

The desired temperature ranges are listed on the left side, and each layer is labeled across the top. If a layer is recommended in a particular combination, its number is highlighted. For example, if you’re hunting in 14°F (-10°C), you’ll want to wear layers 2, 4, and 5.
When paired with 6OL as an outer layer, you can use one less layer or a layer with lower insulation.

The first hunting Underwear Layer, which we call 1UL, is made primarily from bamboo fiber and absorbs moisture 200% more efficiently than cotton. This layer keeps you dry from the start, so you stay comfortable all day.

1UL Underwear Layers:
Made for bamboo-cotton blend:
BAMBOO BASE LONG SLEEVE [1UL] HUNTING T-SHIRT
BAMBOO VENT SHORT SLEEVE [1UL] HUNTING T-SHIRT
Made of cotton: Hunting Boxair

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2nd Hunting Base layer

The second layer, called the hunting Base Layer (2BL), features an inner bamboo fiber surface for maximum moisture absorption combined with 15 µm Merino wool on the outer surface for the fastest moisture evaporation. This unique pairing technology surpasses typical 17.5-18µm Merino base layers by 50%, keeping you warmer without the chill of damp fabric. 

2BL Underwear Layers: 
15.5µm MERINO-BAMBOO TOP [2BL] HUNTING BASE LAYER 
15.5µm MERINO-BAMBOO BOTTOM [2BL] HUNTING BASE LAYER  

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3rd Hunting Mid-layer

The third layer, our hunting Mid-Layer (3ML), made of 18µm Merino-Bamboo fleece, continues this trend with a similar natural fiber structure, synergy and efficiency. Compared to mid-layers made with thicker 20µm Merino wool, this layer offers over 70% more efficiency in moisture management. It’s like your own personal thermostat, enhancing warmth and breathability.

“This synergy among layers means that every layer amplifies the effect of the previous one, helping regulate your temperature efficiently.”

3ML Midlayer:
18µm MERINO-BAMBOO FLEECE HOODIE [3ML] HUNTING MID-LAYER

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4th Hunting Insulation Layer

The fourth layer is the Hunting Insulation Layer, which we call 4IL. Featuring 1000-fill-power down—the most efficient insulation on the market—it delivers 43% more warmth than standard 700-fill down. Ultralightweight yet exceptionally warm, it is engineered for maximum heat retention without the bulk.

The unique seamless tube fabric is crafted with an extremely high-density weave to deliver exceptional breathability, downproofing, and stretch—without relying on the coatings commonly used by others that compromise airflow.
 

4IL Insulation Layer:
1000FP DOWN JACKET [4IL] HUNTING INSULATION LAYER 

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6th Outer Insulated Waterproof Layer

The sixth outer layer, our insulated waterproof layer (6OL), features the world’s most breathable membrane and the lowest weight-to-warmth ratio Matrix® insulation. It outperforms any jacket on the planet in terms of breathability and weight and its ability to withstand extreme cold.

6OL Outer Insulated Waterproof Layer:
6OL ALPHA - WATERPOOF INSULATED HUNTING JACKET
6OL ALPHA - WATERPOOF INSULATED HUNTING PANTS

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The Exponential Advantage

Synergy of Advanced Materials: Each layer's superior materials amplify the performance of the others, leading to exponential gains in warmth, dryness, and comfort.
High-efficiency materials provide maximum warmth and protection without added weight or bulk, reducing fatigue during long treks. 

  

Combined Efficiency Explained

When these layers are worn together, their individual efficiencies compound exponentially rather than simply adding up.

Calculating Combined Efficiency:

• Underwear Layer Efficiency: 3.00 (since bamboo fiber is three times more efficient than cotton)
• Base Layer Efficiency: 1.50 (50% more efficient)
• Mid Layer Efficiency: 1.70 (70% more efficient)
• Insulation Layer Efficiency: 1.43 (43% more efficient)
• Outer Layer Efficiency: 2.13 (113% more efficient)

Total Efficiency:

3.00×1.50×1.70×1.43×2.13≈23.21

What This Means:

Our layering system provides approximately 2,321% greater overall efficiency in thermal regulation compared to the world’s leading competitors.

From the moisture-wicking bamboo underwear to the high-performance outer shell, every layer is crafted with the sole purpose of amplifying efficiency so you stay focused on the hunt.

Try our superb layering system—we promise to outperform the competition and exceed your expectations.

With our advanced layering system, you’re not just prepared for the elements—you’re ready to conquer them.