Best Hunting Base Layers of 2025: According to Testing

When you’re out in the field, battling unpredictable weather and chasing that trophy buck, your outfit can make or break your hunt. And nothing is more critical than your base layer—the first line of defense against cold mornings, sweltering afternoons, and everything in between. A solid base layer wicks away sweat, manages odor, and ensures stay focused on your game instead of shivering or overheating.

For 2025, we’ve tested and hunted in some of the top base layers on the market, putting them through harsh conditions to see which truly stands out. From lightweight options perfect for early-season spot-and-stalk hunts to heavyweight champions for late-season tree stands, these base layers are built to keep hunters comfortable, dry, and ready to take that perfect shot.

The 7 Best Hunting Base Layers of 2025

Whether you’re layering up for frigid days in the backcountry or looking for all-season versatility, the products we’re about to reveal have proven themselves in the field. So, grab your bow, rifle, or crossbow.

• SmartWool Merino 250 Base Layer (Best for Cold Weather)
• Under Armour ColdGear Base 4.0 (Best for Extreme Cold)
• Sitka Core Lightweight Crew (Best for Early-Season Hunts)
• Icebreaker Oasis 200 Base Layer (Best for Versatility)
• First Lite Kiln Hoody (Best for Layering Systems)
• KUIU Peloton 118 Base Layer (Best for Active Hunts)
• Banded Midweight Base Layer (Best Budget Option)

1. SmartWool Merino 250 Base Layer

When the temperature drops, the SmartWool Merino 250 Base Layer is your ultimate companion for staying warm. This base layer is made from with 100% merino wool and offers a perfect balance of warmth, comfort, and breathability. The natural insulator provides reliable warmth in sub-freezing conditions without causing you to overheat when the day warms up.

It has moisture-wicking and odor-resistant properties. The wool fibers naturally pull sweat away from your skin, keeping you dry even during intense activity, such as hiking to your stand or tracking game. We tested this layer on a 5-day winter elk hunt in the Rockies, and it remained comfortable and fresh even after extended use. No more worrying about sweat build-up or unpleasant odors.

The design features a slim fit that hugs your body for efficient layering. The flatlock seams prevent irritation, ensuring that chafing doesn’t ruin your hunt. Whether glassing for elk in the high mountains or sitting still in a frigid deer blind, this base layer provides the warmth and comfort you need. And with its midweight construction, the SmartWool Merino 250 Base Layer is versatile enough to use in different conditions.

2. Under Armour ColdGear Base 4.0

If you’re hunting in extreme cold, the Under Armour ColdGear Base 4.0 is built to keep you warm in the harshest conditions. This heavyweight base layer features a unique dual-layer fabric that traps heat close to your body while actively wicking sweat away to keep you dry. Its brushed interior adds a layer of softness. It is comfortable to wear all day, whether on a stationary hunt or trekking through snow-covered terrain.

During our late-season whitetail hunt in the Midwest, where temperatures dipped into the single digits, the ColdGear Base 4.0 outperformed expectations. It locks in warmth without causing overheating, thanks to its advanced thermal grid technology. Even during a brisk 2-mile hike to the hunting blind, we stayed warm without feeling clammy. The compression fit ensures it moves with your body. This will allow for a full range of motion.

This base layer can adapt to varying levels of activity. Whether you’re waiting motionless in freezing temperatures or moving at a steady pace, the fabric’s breathability ensures consistent performance. It’s an excellent choice for hunters who need a reliable base layer for brutal weather conditions. However, the thickness feels bulky for those layering heavily on top, so it’s ideal to pair with an insulated outer layer.

3. Sitka Core Lightweight Crew Base Layer

For early-season hunts or high-intensity activities, the Sitka Core Lightweight Crew base layer is an excellent choice. This lightweight layer keeps you cool and dry during warm-weather hunts and offers unmatched moisture management and breathability. It’s made from a durable polyester blend with Polygiene Odor Control technology, which ensures you remain scent-free, a crucial factor when pursuing a game with a sharp sense of smell.

We tested this base layer in September (2024) during an archery elk hunt in the Colorado foothills, where temperatures fluctuated between cool mornings and hot afternoons. The Sitka Core Lightweight Crew excelled in regulating body temperature, keeping us cool while hiking steep trails and warm enough when the breeze set in. Its weightless fabric dries quickly, so you won’t feel weighed down by sweat after a long day of stalking games.

This base layer worked as part of a layering system. Its snug yet comfortable fit allows it to pair effortlessly with other layers without restricting movement. Also, the seams are thoughtfully designed to reduce friction, making it an ideal choice for hunters who prioritize comfort during long days in the field.

4. Icebreaker Oasis 200 Base Layer for Hunting

The Icebreaker Oasis 200 Base Layer offers a versatile solution for hunters who need one base layer for various conditions. It is made from 100% merino wool. This midweight layer balances warmth, breathability, and comfort, making it a reliable choice for hunts spanning multiple seasons. You already know that Merino wool provides natural moisture-wicking and odor-resistant properties.

We field-tested this base layer on a 3-day turkey hunt in early spring. Temperatures ranged from chilly mornings to warm afternoons, and the Oasis 200 adjusted seamlessly. It kept us warm when layered under a jacket but didn’t cause overheating during long hikes. The flatlock seams and tagless design further enhance comfort and eliminate irritation during continued wear.

It’s able to perform in both cool and moderate weather. It’s not as heavy as some extreme cold base layers, but it’s warm enough for mild winter days. This versatility makes it a valuable addition to any hunter’s wardrobe. Also, its durability ensures it’ll last through multiple seasons of use. So, if you’re looking for a base layer that can handle a wide range of conditions, the Icebreaker Oasis 200 is a fantastic option.

5. First Lite Kiln Hoody Hunting Base Layer

The First Lite Kiln Hoody is the ultimate base layer for hunters who rely on a robust layering system. It is made from a blend of merino wool and nylon. This base layer combines the best natural insulation with synthetic fibers’ added durability. The Kiln Hoody can handle everything from early-season bow hunts to late-season rifle pursuits, making it a versatile addition to your hunting gear.

We tested the Kiln Hoody on a 7-day elk hunt in Montana, where temperatures fluctuated dramatically. Its midweight construction provided enough warmth to keep us comfortable in freezing mornings, while its moisture-wicking properties excelled during uphill treks. The hood design was convenient for added warmth without needing an extra beanie, and its slim fit allowed it to function perfectly under additional layers.

The thumbhole cuffs keep the sleeves in place, making layering hassle-free. The flatlock seams and incredibly soft fabric ensure comfort, even during extended wear. Thanks to the merino wool’s natural odor control, the Kiln Hoody performed well across multiple days without needing a wash.

6. KUIU Peloton 118 for Active Hunts

The KUIU Peloton 118 is designed for hunters who need a lightweight and highly breathable base layer for active pursuits. It is crafted from KUIU’s exclusive Toray Karuishi fabric, which offers exceptional moisture management and keeps you dry during high-energy hunts. It’s the lightest base layer in the KUIU lineup, making it a fantastic choice for early-season or active hunts where mobility and comfort are essential.

During our field test on an antelope hunt in Wyoming, the Peloton 118 proved its worth. It kept us cool during the midday heat and wicked sweat away efficiently while hiking across open terrain. Its ultra-soft fabric feels great against the skin, and the athletic fit ensures it stays in place without bunching up under other layers. The quick-drying properties were useful when we worked up a sweat and needed to cool down quickly.

Although it’s not designed for cold weather, the Peloton 118 pairs exceptionally well with insulating layers for cooler mornings. The anti-microbial finish prevents odor build-up, which is a huge plus for multi-day hunts. Overall, the KUIU Peloton 118 performs well during high-intensity hunts.

7. Banded Midweight Budget Base Layer

Banded Midweight Base Layer offers exceptional performance at an affordable price, making it a great choice for hunters on a budget. A synthetic polyester blend provides a solid balance of warmth, moisture management, and durability. It’s a versatile option that performs well in mild to moderately cold conditions, whether sitting in a tree stand or moving through the woods.

We tested the Banded Midweight Base Layer during a weekend deer hunt in late October (2024). With temperatures hovering around 40°F, this base layer kept us warm with no bulky outerwear. Its moisture-wicking properties worked effectively during short hikes to our hunting spot, and the fabric dried quickly.

While it doesn’t have the premium features of pricier options, such as odor control or flatlock seams, the Banded Midweight Base Layer delivers dependable performance for the cost. The relaxed fit ensures a comfortable feel, and it works well as a standalone layer in mild weather or as part of a layering system for cooler days.

How to Choose the Best Hunting Base Layers?

This buying guide will walk you through the critical factors to consider when selecting a base layer tailored to your hunting needs.

Material Matters: Know Your Fabrics

The fabric of your base layer plays a significant role in its performance. Here’s a breakdown of common materials:

• Merino Wool: Known for its excellent insulation and natural odor resistance. Merino wool is soft, moisture-wicking, and suitable for cold-weather hunts. However, it can be more expensive and slightly less durable than synthetics.
• Synthetic Blends (Polyester, Nylon, Spandex): These materials are excellent for moisture-wicking, quick-drying, and durability, making them ideal for active hunts. They lack the odor control of merino wool but are often more affordable.
• Blends: Some base layers combine merino wool with synthetic fibers, offering the benefits of both: warmth, durability, and odor control.

Weight Classification: Light, Mid, or Heavy?

Base layers are categorized by weight, each suited for specific weather conditions and activity levels:

• Lightweight: Ideal for early-season hunts or high-intensity activities. Lightweight base layers focus on breathability and moisture-wicking, keeping you cool and dry.
• Midweight: Versatile and suitable for a variety of weather conditions. They provide a balance of warmth and breathability, making them great for layering systems.
• Heavyweight: Designed for cold weather or sedentary hunts, such as sitting in a tree stand. These layers prioritize insulation and warmth.

Fit and Comfort

The fit of your base layer affects its performance. Base layers should fit close to your body to wick moisture and trap heat efficiently. Look for athletic or slim-fit designs. With spandex or elastane ensure better movement and flexibility during active hunts. Flatlock seams reduce chafing and improve overall comfort, especially during long hours of wear.

Moisture Management and Breathability

Hunting often involves fluctuating activity levels, from sitting still to hiking uphill. A good base layer should wick sweat away from your skin and allow it to evaporate quickly. Breathable fabrics prevent overheating during high-energy hunts and keep you dry when the temperature drops.

Temperature Regulation

A base layer’s ability to trap heat while allowing excess warmth to escape is crucial for maintaining comfort. Look for materials like merino wool or advanced synthetics with thermal regulation properties to adapt to varying conditions.

Odor Control

Multi-day hunts or long hours in the field can lead to odor build-up. Base layers with natural odor resistance (like merino wool) or treated synthetic fabrics (anti-microbial finishes) are essential for staying fresh and undetectable to the game.

Durability and Maintenance

Hunting gear must withstand rugged use, and your base layer is no exception. Synthetic materials often last longer than pure wool. Reinforced areas like elbows and knees add to the lifespan. Merino wool requires gentle washing, while synthetics are generally machine washable and easier to maintain.

Layering Compatibility

Your base layer is just one part of your hunting clothing system. Ensure it integrates well with your mid and outer layers without restricting movement or causing discomfort. Thumbhole cuffs, longer hems, and hooded options can improve layering efficiency.

Weather and Hunting Environment

Match your base layer to the conditions you’ll face: For cold weather, opt for heavyweight merino wool or synthetic blends with added insulation. Prioritize quick-drying synthetic fabrics for wet conditions. For active hunts, lightweight, breathable, and moisture-wicking base layers work best for high-energy activities.

Budget vs. Performance

Premium brands like Sitka, First Lite, and KUIU offer high-performance base layers with advanced features, but they come at a higher price. If you’re on a budget, brands like Banded or Drake provide dependable performance at a lower cost. Prioritize features that matter most to your hunting style.

FAQs: Hunting Base Layers

Can I use the same base layer for different seasons?

It depends on the base layer’s weight and material. Lightweight synthetic or merino wool layers are versatile and suitable for early-season and active hunts, while heavyweight layers are better for cold weather. If you hunt in varying conditions, consider owning both lightweight and heavyweight options for layering.

How do I clean and maintain my base layers?

• Merino Wool: Wash in cold water on a gentle cycle with a mild detergent. Avoid fabric softeners and high heat during drying to preserve the wool’s natural properties.
• Synthetics: Machine wash with regular detergent and dry on low heat or air dry. Synthetic layers are more durable and easier to maintain. 

Always check the care label for specific instructions.

Can a base layer prevent odor while hunting?

Yes, certain base layers can minimize odor. Merino wool naturally resists bacteria that cause odors, while some synthetic layers are treated with antimicrobial finishes to reduce smells. This feature is useful for multi-day hunts or situations where staying scent-free is critical for avoiding detection by game.

What’s the difference between a hunting-specific base layer and regular outdoor gear?

Hunting-specific base layers are designed with features tailored to hunters, such as camo patterns for concealment, quieter fabrics to reduce noise, and scent control technology. They also prioritize comfort for extended use and layering compatibility with hunting outerwear.

Do I need different base layers for tree stand hunting and spot-and-stalk hunting?

Yes, your hunting style can affect the type of base layer you need:

• Tree Stand Hunting: Heavyweight base layers are ideal for sitting still in cold temperatures. They provide excellent insulation.
• Spot-and-Stalk Hunting: Lightweight or midweight base layers with moisture-wicking and breathability are better for active hunts that involve a lot of movement.

Are thumbholes and hoods useful in base layers?

Yes, thumbholes help keep the sleeves in place when layering and provide extra warmth to your hands. Hoods add warmth and protection for your head and neck, which are critical areas for retaining body heat. Both features enhance layering efficiency and overall comfort in colder conditions.

Are base layers with camo patterns necessary?

Not necessarily. Although camo patterns can help with concealment during hunts, they aren’t mandatory for base layers since they are worn underneath other layers. If you expect to shed outer layers during warm weather hunts, camo base layers provide additional stealth.

Final Thoughts

The right hunting base layer is an investment in your comfort and performance. This list of the 7 Best Hunting Base Layers of 2025 covers a variety of options to suit every hunting style, weather condition, and budget. Each base layer on this list was field-tested by hunters like us, ensuring these recommendations reflect real-world performance.

For top-tier performance, the Sitka Core Lightweight Crew shines as an all-season performer. First Lite Kiln Hoody is perfect for layered systems in harsh environments. If active hunts are your focus, the lightweight and breathable KUIU Peloton 118 keeps you dry and mobile. On the other hand, the budget-friendly Banded Midweight Base Layer offers reliable comfort and warmth without breaking the bank.

Other top-rated hunting clothes you can check now:

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• Best Camo Hats: Reviewed and Tested
• Best Hunting Face Mask Review