Base layer for extreme cold is essential for anyone venturing into frigid conditions, as it provides the necessary insulation and moisture-wicking properties to keep you warm and dry. In 2025, the market offers a variety of high-performance options designed to meet the demands of extreme weather. From advanced synthetic materials to merino wool blends, these base layers ensure optimal comfort and thermal regulation. Whether you're skiing, hiking, or simply braving the cold, investing in the right base layer can make all the difference in your outdoor experience.
Thermajohn Long Johns Thermal Underwear for Men Fleece Lined Base Layer Set for Cold Weather (Large, Black)
- Heat Retention: When it comes to warmth and everyday wear, these long johns for men is designed specifically for you to stay protected from the cold.
- Ultra Soft Fleece: Designed with a fleece lining & quality material, these ultra soft mens thermal underwear set will keep you feeling comfortable throughout the day.
- Moisture Wicking: Stay dry with these long underwear mens as they're made from breathable fabric that effectively wicks away moisture and perspiration.
- 4 Way Stretch: Made with stretchable material, these thermals for men allows you freedom of movement with no chafing or bunching up when you move.
- Layer Up: Layering is essential to ward off the cold, so bundle up with a pair of mens thermals this winter and stay comfortable while outside or in bed as a pajama.
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Carhartt Men's Force Heavyweight Thermal Base Layer Pant, Shadow Heather, Medium
- Concealed dry low-stitch waistband and contoured front for comfort; made for extreme cold weather
- Fast dry wicks away sweat and rugged flex technology for ease of movement
- Smooth flat lock seams and tag less label enhance comfort
- Strategic seam placement for maximum comfort and reduced chafing
- Fights odor
$49.99
SALE
−$30.00
Merino.tech Merino Wool Base Layer Mens Set - Heavyweight, Midweight, Lite Merino Wool Thermal Underwear For Men Top, Bottom (Large, 250 Black)
- Midweight: Mens Merino Base Layer Available in: Lightweight = 165 g/m², Midweight = 250 g/m², Heavyweight = 320 g/m². Free Merino Wool Hiking Socks ($21 Value) – Package includes Midweight Merino wool base layer mens top and wool men long johns 250 g/m² + Merino Wool Hiking Socks. Cool Packaging. Makes A Great Gift.
- Super Soft & Comfortable: 100% Superfine 17.5 Micron merino wool base layer set mens provides all day comfort and no itch! Merino wool long underwear men set was designed for daily wear without rubbing, overheating, or bunching of regular cotton.
- Moisture Wicking & Odor Resistant: Natural wicking and odor-resistant properties of merino wool thermal underwear allow it to absorb moisture better than any other fabric, keeping you dry and fresh.
- Breathable – For longer lasting wear, hand wash and lay flat to air dry. Mens wool long johns sets naturally regulate body temperature to keep you comfortable all year round.
- Zero Worries: Every we make merino wool base layer top mens and long johns are backed by our Merino.tech Promise - ensuring you're 100% happy with every Merino.tech purchase. For best results hand wash and lay flat to dry
$99.99
Cyathea Mens Thermal Underwear Set Ultra Thick for Extreme Cold Weather Gold Fleece Lined Long Johns Winter Base LayerBlackM
- SOFT FABRIC - We use 100% Cotton of shell and 95% Polyester&5% Spandex fleece lined fabric to bring extreme warmth in winter, giving you a sense of security all winter long
- MOVE FREELY - The mens long johns thermal set is made from 4-way stretch fabric that offers high elasticity to allow you freedom of movement without rubbing or bunching as you move. Keeping you warm without sacrificing movement or comfort
- CONVENIENT - These long johns feature a double-layer open fly design, allowing for easy access and convenience when nature calls.
- PERFECT LAYER - With a pair of men's thermal underwear, you will stay comfortable outdoors (climbing, skiing, running etc...) or just in bed as your pajamas on chilly nights.They provide insulation by trapping body heat, and can be worn under everything
- EASY CARE - These men's long johns are interlock stitched to keep them in tip-top condition. They're built to last, with a strong and stable fabric that won't pilling or deformation. Plus, they're machine washable for your convenience
$16.00
SALE
−$5.00
Spyder Women's Thermal Underwear Set - 2 Piece Brushed Back Fleece Lined Long Johns Base Layer Set for Women (Sizes: S-XL), Size Large, Black
- AUTHENTIC SPYDER: Active Thermal Base Layer Set for Women; Products built with over 40 years of performance research in the science of speed
- ULTIMATE WARMTH AND INSULATION: Stay cozy in cold weather with this women's thermal underwear set, featuring brushed back fleece lining for exceptional insulation. Perfect as base layer women cold weather gear, this set delivers reliable heat retention while remaining lightweight and breathable for all-day comfort.
- DRYWEB MOISTURE WICKING TECHNOLOGY: Engineered with advanced DryWeb technology, the thermal shirts for women for cold weather pull moisture away from your skin to keep you dry and comfortable during outdoor activities. Ideal for winter sports, skiing, or resting at home, these thermal tops for women offer maximum performance.
- FLEXIBLE AND SNUG FIT: Designed with 2-way stretch FlexWeb fabric, this womens thermals top and bottom set offers a secure, snug fit while allowing unrestricted movement. The womens layering long sleeve shirt features a flexible waistband and snug-fit ankle cuffs for a sleek, secure feel under layers or alone.
- VERSATILE BASE LAYER PERFORMANCE: Whether you're heading out for winter sports or layering up for cold mornings, this thermal base layer women set works perfectly as warm layers for women winter or standalone thermal long sleeve women wear. Soft, fleece-lined fabric keeps you cozy without sacrificing style or flexibility.
$24.99
Thermajohn Thermal Shirts for Men Long Sleeve Thermal Compression Shirts for Men Base Layer Cold Weather (Charcoal, Large)
- Heat Retention: When it comes to warmth and everyday wear, these mens thermal long sleeve shirt is designed specifically for you to stay protected from the cold.
- Ultra Soft Fleece: Designed with a fleece lining & quality material, these ultra soft mens thermal shirt will keep you feeling comfortable throughout the day.
- Moisture Wicking: Stay dry with these mens long underwear as they're made from breathable fabric that effectively wicks away moisture and perspiration.
- 4 Way Stretch: Made with stretchable material, these thermal tops for men allows you freedom of movement with no chafing or bunching up when you move.
- Layer Up: Layering is essential to ward off the cold, so bundle up with thermal underwear for men this winter and stay comfortable while outside or in bed as a pajama.
$18.99
Carhartt Men's Force Heavyweight Thermal Base Layer Long Sleeve Pocket Shirt, Shadow Heather, Medium
- Convenient zip pocket on chest; made for extreme cold weather
- Fast dry wicks away sweat and rugged flex technology for ease of movement
- Smooth flat lock seams and tagless label enhance comfort
- Concealed thumb loops
- Fights odor
$51.99
Under Armour Men's ColdGear® Base 4.0 Leggings LG Black
- UA Base 4.0 Extreme Baselayer is our warmest yet, delivering extreme warmth in the extreme cold|UA Scent Control Technology to keep you undetected in all pursuits|Soft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortable|Material wicks sweat & dries really fast|4-way stretch construction moves better in every direction|Performance elastic waistband
$100.00
HEROBIKER Women's Thermal Underwear Set, Ultra Soft Thermal Shirt Long Johns with Fleece lined - Winter Base Layer Sets（L, Black
- BEAT FOR WOMEN: The warmest base-layer option that HEROBIKER offers. Womens Thermal underwear set is made of 92% ultra-soft polyester 8% spandex with great breathability. And super skin-touch fabric that feels cozily soft.
- FLEXIBILITY for ANY MOVEMENT: The latest 4-way stretch material provides a breathable and comfortable fit, ultra soft that you can even hardly feel its existence. Base layer fabric is light but thick, which fits the skin perfectly
- KEEP WARM & COMFORTABLE: These thermal underwear are perfect for cold weather, comfy stretch softwear in normal thickness is lightly fleece lined, lightweight but warm. Perfect gift for family or friends
- MOISTUGRE-WICKING FEATURES: Excellent for thermal retention， light weight, and high quality. "Extremely breathable and odor-resistant, while wicking moisture away." Ideal for women. You no longer have to worry about that sticky feeling as work out
- 🍀FOR ANY OCCASION🍀Long johns set are idea for all kinds of indoor/outdoor activities, such as shopping, cycling, skiing, climbing, running, snowboarding, yoga, fitness body training etc
$24.98
SALE
−$6.41
Polar Extreme WOMENS BRUSHED BASE LAYER 2 PC SET - MEDIUM -BLACK
- Brushed Fabric: Soft and gentle against the skin, providing superior warmth and comfort.
- 2-Piece Set: Includes both a top and bottom, offering full-body coverage and protection from the cold.
- Moisture-Wicking: Keeps you dry by drawing sweat away from your skin, ensuring all-day comfort.
- Versatile Use: Ideal for outdoor activities, winter sports, or as a comfortable layer for everyday wear.
$18.58
Last update on 2025-05-02 / Affiliate links / Images from Amazon Product Advertising API