Base Layers & Thermals

Base layers & thermals are essential for staying comfortable when the temperatures drop. Whether you’re heading out for a brisk morning hike, gearing up for a winter adventure, or just looking to add extra warmth to your everyday routine, these pieces provide reliable comfort and versatility. Crafted with quality materials and designed for lasting value, our collection of base layers & thermals makes it easy to enjoy the great outdoors all season long. Layer up and embrace every chilly day with ease and confidence.

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476 Items

Men's Cresta Wool Midweight 250 Crew Top

A versatile dark black merino wool base layer that wicks sweat, resists odor, and keeps you warm.

Pros: Perfect fit Soft and comfortable Durable fabric Available in big and tall sizes Great warmth
Men's Silk Underwear, Pants
Price was from: $54.95 now: $45.99

A lightweight, solid red silk base layer pant offering warmth and comfort without bulk.

Pros: Provides warmth Well made and sturdy Prevents chafing Comfortable fit Lightweight and thin
Men's Cresta Midweight 250 Pants

A versatile base layer made of itch-free merino wool, wicking sweat and resisting odor in dark black.

Pros: Great color Versatile use Soft and lightweight Excellent warmth Comfortable fit
Women's Cresta Midweight 250 Pants, High-Rise Slim-Leg

A high-rise, slim-leg base layer made of 100% merino wool, perfect for versatile warmth and comfort.

Pros: Great fit High-quality fabric Non-itchy material Comfortable to wear Excellent warmth
Men's Cresta Midweight 250 Quarter-Zip Top

A versatile merino wool quarter-zip top in saddle heather, perfect for warmth and odor resistance.

Pros: Keeps you warm Excellent base layer Comfort Durability Versatility
Women's Cresta Midweight 250 Crew Top

A dark black, form-fitting merino wool crew top that wicks sweat, resists odor, and keeps you warm.

Pros: Great fit Breathable fabric High quality Perfect base layer Excellent warmth
Women's Cresta Midweight 250 T-Zip Top

A dark black, merino wool base layer that wicks sweat, resists odor, and features thumbhole cuffs.

Pros: Well-made Warmth True to size Versatile Comfortable
Men's Cresta Ultralight 150 Crew Top

A remarkably soft and warm alloy gray base layer made from 100% merino wool with thumbhole cuffs.

Pros: Soft material Warmth Good fit Comfortable Well made
Women's Cresta Ultralight 150 Crew Top

An alloy gray, form-fitting base layer made of 100% merino wool, perfect for any season.

Pros: Not itchy Lightweight Versatile Comfortable Warm
Women's L.L.Bean Simple Soft Base Layer, Crew

A lightweight, moisture-wicking black base layer crewneck made from 94% polyester and 6% spandex.

Pros: Great fit Smooth fabric Softness Dino style Material
Women's Cresta Ultralight 150 Pants, High-Rise Slim-Leg

A high-rise, slim-leg base layer made of 100% merino wool, offering warmth and comfort year-round.
Women's L.L.Bean Simple Soft Base Layer, Pants

A lightweight, moisture-wicking synthetic base layer pant in dark black, perfect for everyday warmth and comfort.

Pros: Adds extra warmth Lightweight Softness Good fit Comfortable
Women's Cresta Wool Ultralight 150 Base Layer, Hoodie
Price was from: $99.95 now: $84.99

An ultralight, alloy gray Merino wool hoodie that wicks moisture, resists odors, and fits comfortably under helmets.

Pros: High-quality material Easy to care for Perfect under layer Lightweight design Comfortable fit
Men's L.L.Bean Simple Soft Base Layer, Pants

A lightweight, moisture-wicking synthetic base layer pant in dark black heather for everyday warmth and comfort.

Pros: Great for layering Provides warmth Lightweight feel
Men's Cresta Wool Ultralight 150 Base Layer, Hoodie

An ultralight, alloy gray Merino wool hoodie that wicks moisture, resists odors, and fits comfortably under helmets.

Pros: Soft and fleecy interior Ideal for winter sports Warm and comfortable Good fit Fashionable and supportive
Women's Cresta Ultralight 150 Crew Top, Stripe

An itch-free 100% merino wool base layer top, perfect for cold-weather sports and everyday comfort.

Pros: Provides excellent warmth Soft merino wool material Great as long underwear
Men's L.L.Bean Heavyweight Base Layer Pant, Print

A heavyweight base layer pant in kelp green camo, made from recycled polyester and elastane.
Men's L.L.Bean Simple Soft Base Layer, Crew

A lightweight, dark black heather crewneck base layer made from moisture-wicking, quick-drying synthetic fabric.
Men's Cresta Ultralight 150 Turtleneck, Stripe
Price was from: $99.95 now: $84.99

A lightweight, itch-free 100% merino wool turtleneck in regatta blue, perfect as a base layer for winter sports.
Women's Silk Pointelle, Long-Sleeve Scoopneck

A weightless black silk long-sleeve scoop neck that layers effortlessly with a feminine pointelle-knit design.

Pros: Versatile layering piece Cute print design Beautiful color Soft and lightweight Comfortable fit
Women's Silk Pointelle, Pants

A virtually weightless pair of cream silk pants with a feminine pointelle-knit and elasticized waist.

Pros: Comfort Light weight Warmth Softness Good fit
Kids' Wicked Warm Midweight Long Underwear, Top Print
Price was from: $29.95 now: $24.99

A multi-color printed synthetic top with thumbhole cuffs that keeps kids warm and dry all winter.

Pros: Makes a great gift Good price Attractive design Flattering cut Comfortable fit
Kids' Wicked Warm Long Underwear, Expedition-Weight Pants

A moisture-wicking, quick-drying base layer with brushed fleece lining and four-way stretch for winter sports.

Pros: No annoying seams True to size Cozy Warm Super soft
Kids' Wicked Warm Long Underwear, Expedition-Weight Top

A pink expedition-weight kids' base layer top made from moisture-wicking, quick-drying synthetic fleece blend.

Base Layers & Thermals

When it comes to staying comfortable through the shifting seasons, base layers and thermals are the unsung heroes of any outdoor wardrobe. These next-to-skin essentials form the foundation for warmth, helping you make the most of every chilly morning walk, spring camping trip, or late-season ski run. The key to a great base layer is its ability to regulate body temperature by wicking away moisture and trapping just the right amount of heat—keeping you dry and cozy whether you’re shoveling the driveway, cheering on the sidelines, or enjoying a brisk hike with family. Materials like merino wool stand out for their natural softness, odor resistance, and reliable warmth, making them a favorite for all-day comfort. Synthetics, on the other hand, excel at drying quickly and holding up to more rugged use, especially if your daily adventures tend to get your heart rate up. Most base layers are offered in a range of weights—from lightweight options perfect for layering under spring jackets to heavyweight thermals designed for the coldest days—allowing you to tailor your outfit to match the forecast and your activity level.

Thoughtful details make all the difference when choosing base layers and thermals that stand up to daily wear. Look for flatlock seams that minimize chafing, stretchy fabrics that move with you, and moisture-wicking technology that keeps you feeling fresh no matter how many layers you pile on. These pieces are designed to be versatile and easy to use, seamlessly transitioning from outdoor pursuits to cozy nights at home. Base layers make a practical and thoughtful gift for anyone who loves spending time outside, from avid hikers and winter sports enthusiasts to commuters and kids waiting at the bus stop. They’re also a favorite among travelers who need to pack light but stay prepared for unpredictable weather. Whether you’re layering up for a weekend in the woods or simply want to stay comfortable on a cool morning run, having the right base layer ensures you’re ready for anything the day brings. For everyday comfort and lasting value, explore our selection of Everyday Thermal Underlayers—you’ll find timeless styles made to keep you warm, dry, and ready for whatever adventure comes next.

FAQs

Base layers and thermals are designed to keep you comfortable in cool and cold conditions by wicking moisture away from your skin and trapping body heat. This helps regulate your temperature, keeps you dry during active pursuits, and adds an extra layer of softness and comfort under your clothing.

The most common fabrics for base layers and thermals are merino wool and synthetic materials like polyester blends. Merino wool is appreciated for its natural warmth, softness, and odor resistance, while synthetics are known for their durability, quick-drying properties, and ability to handle high-intensity activity.

Base layers come in lightweight, midweight, and heavyweight options. Lightweight base layers are ideal for milder temperatures or high-output activities, midweight offers versatility for a range of conditions, and heavyweight thermals provide maximum warmth for very cold or low-activity days.

Absolutely. While base layers and thermals are popular for hiking, skiing, and camping, they’re also great for everyday wear, commuting, traveling, or simply staying cozy at home during cooler months.

Look for features such as moisture-wicking fabrics, flatlock seams to prevent chafing, 4-way stretch for mobility, and materials that feel soft against the skin. These details contribute to all-day comfort and lasting performance.

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Base Layers & Thermals