Best Thermal Mens Base Layers in 2026

Odor-resistant

Temperature regulating

Will help keep you cool when your intensity amps up, and its design helps minimize chafing

Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior

Stretch-mesh back & underarm panels provide strategic ventilation without sacrificing warmth

4-way stretch construction moves better in every direction

87% Polyester, 13% Spandex. Fleece Lined. Machine Washable.

Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior. For all-over warmth, pair the shirts with our youth sports tights.

Moisture wicking/ Quick-Dry fabric absorbs sweat from the skin,keeping you dry and comfortable

WOOL LEGGINGS FOR MEN: These second skin wool leggings with fly are the perfect foundation for your everyday cold-weather layering system. Insulated, breathable & odor resistant for long days & nights of hiking & camping.

MEN'S LEGGINGS: Wool men's base layer slim fit leggings feature brushed elastic waistband for a comfortable fit & flat-lock seams to reduce chafing. Crafted of 100% merino wool.

MERINO WOOL LAYERS: Stay warm from head to toe in Icebreaker outdoor clothing gear. Keep covered in wool gloves, glove liners, mittens, bras, wool base layers such as tops, under shirts, leggings, bras, underwear & more.

LIGHTWEIGHT – Mens Merino Base Layer Available in: Lightweight = 165 g/m², Midweight = 230-250 g/m², Heavyweight = 320+ g/m².

SUPER SOFT & COMFORTABLE – 100% Superfine 17.5 Micron Merino Wool Mens Base Layer provides all day comfort and no itch! Designed for daily wear without rubbing, overheating, or bunching of regular cotton.

MOISTURE WICKING & ODOR RESISTANT – Merino base layer mens natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.

Stay warm with temperature-regulating wool-polyester blend

Fast dry wicks away sweat and rugged flex technology for ease of movement

Smooth flat lock seams and tagless label enhance comfort

ULTRA SOFT AND SUPER WARM: CL Convallaria mens thermal underwear set is made of 90% Polyester / 10% Spandex blend fabric with high density fleece lined, the insulation material which can lock your body heat well. The super skin-touch and ultra soft long johns for men fit snug like a second skin for minimizing heat loss and keep you warm in the cold winter.

STRONG MOISTURE WICKING(WITHOUT THE SWEATY MESS): Our fans say the unique breathable, moisture-wicking fibers on CL thermal underwear will wick away moisture to keep you dry with no sticky or clammy feeling so you can wear them all day for your work or snow adventure. The smiles on men's faces will tell you how satisfied with this thermal underwear set.

4-WAY STRETCH INSULATED UNDERWEAR: While adopting the design of the Four-way stretch, we improved the crotch and armpit according to the feedback of market customers. make the reach and squat more comfortable while retaining excellent elasticity and durability for maximum mobility. CL uses high-quality stitching for thermal leggings and long sleeve shirts to beat super-active days and many muddy adventures.And insulated design let you get rid of static trouble in dry autumn and winter.

Men's thermal underwear is made of polyester and micro-fleece fabric to give the ultimate warmth during the cold weather. Mens base layer will keep you slim and warm in winter or spring.(Note:this thermal set no open fly)

Breathable and moisture wicking fabric is perfect to keep sweat away and dry fast, mens thermal clothes can removes sweat and stickiness while preventing colds.The mens compresssion set will make you feel relax after you sports.

Ultra soft brushed back fabrication provides ultra-comfortable wear Long johns for men is extremely soft and smooth, lightweight, and non-bulky, anti-static four-way stretch fabric for a snug-fit, shrinkage controlled for lasting size and shape retention.

Sun Protection: breathable face cover design for your outdoor activities which provides windproof and UPF50+ for your top,facial, neck, head for all-round protection from the sun's harmful UVA/UVB rays.

Quick Dry & Breathable: Actively wicks moisture away from the skin, keeping you dry and comfortable. Great when you're out and about, and after washing too.

The 4-Way Stretch: The 4-way stretch & non see through fabric wicks moisture away from your skin for unrestricted movement and whole day comfort.

PACKAGE INCLUDES: 1 – Men’s Merino Wool Thermal Crewneck Top in Black / X-Large | MATERIAL: 18.5 Micron, 100% Merino wool, 400g/m2 | FIT: Fitted

SUPER SOFT: 100% all natural superfine 18.5-micron Merino wool ensures comfort all day – no itch! EASY CARE: Heavyweight long sleeve crew top shirt is machine-washable and dryer-safe, so it’s ready when you are for your next adventure.

400g OF WARMTH: Our most popular 250g midweight crewnecks just got an upgrade! Take your warmth to the next level with our new 400g heavyweight crewneck tops. The perfect base or mid layer for cold to freezing conditions make these thermal tops our warmest and thickest base layers yet! COMFORTABLE & CONVENIENT: These quick-drying shirts with a UPF Rating 50+ are perfect for your next trip, whether your camping, hiking, hunting, playing sports, skiing, or partaking in any outdoors activity.

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.

Materials: Polyester; Wrinkle-free, Quick Dry and Soft

UPF 50+: Excellent protection from the harmful effects of the Sun's UV Radiation

Quick Dry: This men's long sleeve shirt features high performance wicking fabric that pulls moisture away from skin, breathes freely and dries quickly for active

A 2-layer construction with flatlock seams, 100% wool exterior and the unique properties of technical lifa technology

[Excellent Flexibility For Any Movement] The men’s thermal clothing is designed with four way stretch compression for your freedom of outdoor activities, never have bound feeling. Flat lock will prevent chafing and irritation of skin. Ignore the size chart provided by amazon, check the size chart of the last picture to select the appropriate size *The set is designed for outdoor sports, there is NO OPEN FLYING on the pants*

[Slim&Light But Keep Warm In Winter] There are a long sleeves shirt and pants in package. They’re really light, soft and comfortable, especially for keeping warm in cold conditions. Ensure that the thermal long johns for men will bunch around your waistline or sleeves and reduce heat loss.

[Instantly Absorbing Sweat In Exercise] The thermal fitness shirt for men is made of moisture wicking and breathable fabric, which will absorb sweat and dry quickly in exercise and keep away from clammy feeling, provide a enough comfort and warmth when you play sports in cold weathers.

TSLA Thermal Shirt Series designed for cold weather.

[Materials] Mix of Polyester & Spandex fabric is excellent elasticity with enhanced range of motion.

[Fleece Lining] Thermal fleece lining designed to enhance the warmth and thermal insulation.

Soft thermal fleece interior lining helps keep you warm

Form-fitting design for enhanced performance and mobility

Quick drying moisture-wicking fabric to keep you dry and comfortable

Reliable Heat Retention: These insulated pants for men feature our 2-layer design, which traps air between layers of fabric to provide a natural barrier of warmth

Comfortable Cotton-Poly Construction: Our men’s thermal pants are constructed of a comfortable cotton blend enhanced with polyester for added stability and utility

Comfort-Driven Design: The ultimate workout leggings, our men's thermals feature a tagless design, flat seams, and front and back rise for next-to-skin comfort; Ribbed cuffs help keep the cold out, while gussets and a front fly enhance functionality and maintain coverage while you're active

100% polyester

imported

no closure

Durable Moisture Wicking Fabric: Made of 100% CPT Performance Polyester on the inside and 70/30 Polyester/Merino Wool blend on the outside; Intellifresh freshness protection keeps unpleasant odors from forming on our thermal shirt

Regular Fit Thermals for Men: These thermal shirts for men feature a tagless design with flat seams and true sizing for accurate fit

Efficient Design: This men's long underwear top has convenient stay-put cuffs and a drop tail that maintains coverage and freedom of motion when worn during various activities

MIDWEIGHT BASE LAYER AND MOISTURE TRANSFER FIBERS - Our base layers are designed for warmth, performance (including but not limited to breathability and moisture management), and wearable comfort. The adventure is yours, we'll keep you warm and comfortable. An essential feature in all our products, Hot Chillys exclusive moisture transfer fibers (MTF) move moisture away from your body by employing hydrophobic yarns to wick away perspiration, thereby keeping you dry and comfortable.

BODY FIT AND UPF 30+ - Designed with 4-way stretch, these fabrics hug your body for a next-to-skin fit, enhancing breathability and moisture management. Body fit garments move with you, allowing full range of motion while staying against your skin. Ultraviolet Protection Factor. Sunlight includes rays of ultraviolet (UV) radiation, and Hot Chillys products are designed to help protect you!

WARMTH FACTOR 8/10 - Ranked from Mild to Hot, the Warmth Factor Thermometer tells you how warm each of our products is. Warmth Factors 6, 7, and 8 are considered Midweight and are very popular for most cold-weather activities.

MULTIPURPOSE RASHGUARD FOR MEN: Our Rash Guards are perfect for Mixed Martial Arts, No-Gi Jiu-Jitsu, Grappling, Wrestling, Kick Boxing, Cross-Training, Gym, Workout and Fitness.

COMFORT and FLEXIBILITY: Hardcore Training has created this high-quality Rash Guard to offer you full flexibility, freedom, and protection during any special training. The premium fabric consists of 88% Polyester and 12% Spandex.

SECOND SKIN FEELING: Our BJJ Rash Guard is ultra-tight to a perfect fit on your body allowing you to move freely and exercise any fighting move and pose.

Moisture-Wicking Fabric: Long johns for men feature a 100% CPT Performance polyester interior and 70/30 polyester/merino wool exterior with Silvadur Intelligent Freshness for odor control

Regular Fit: Our men’s long underwear boasts a tagless design for a smooth, ultra-comfortable fit; Front and back rise come in true sizing for accurate fit

Efficient Design: Our men's thermal underwear features convenient gussets and a comfortable non-itch waistband that maintains coverage and allows for freedom of motion during various activities

Odor Resistant: Merino wool is extremely absorbent and has a breathable surface that quickly evaporates moisture without odors, keeping you dry. This is extremely important in cold winters to keep you from catching a cold. Great for outdoor activities, hiking/camping/hunting/skiing...

Temperature Regulation: One of Merino wool's most famous features is its natural ability to keep you warm when it's cold without feeling too hot, and cool when it's hot. There's no better way to wear a merino wool base layer mens in a changing climate.

Ultra Soft & Comfortable: 100% superfine 18.17 micron merino wool long sleeve shirt men is soft and comfortable, and fits gently against the skin without itching. Merino wool itself is extremely elastic, fits well and moves freely.

Men's long-sleeve waffle knit pullover undershirt and bottoms. Dickies thermal winter gear add an extra layer of warmth to your cold-weather looks with these long-sleeve thermal long johns for men from Dickies.

The cotton/spandex-blend fabric of this mens base layer set keeps you comfortable and warm. This men's long-sleeve thermal wear undershirt is made from a soft, moisture-wicking fabric blend.

Dickies mens long johns poly-spandex construction grants enhanced insulation, and the cozy flat lock pattern helps trap warmth and keep you comfortable all through the winter days without any extra bulk.

Comfortable Base Layer: Our men's long underwear features dual-layer engineering with Merino Wool fabric that traps body heat between the layers to provide a chill-blocking natural barrier of warmth

Efficient Design: Our men's thermal underwear features convenient gussets and a comfortable non-itch waistband with a functioning front fly that maintains coverage and allows for freedom of motion during various activities

Regular Fit: Our men’s long underwear boasts a tagless design and flat seams for a smooth, ultra-comfortable fit; Front and back rise feature true sizing for accurate fit

TOP TO BOTTOM WARMTH: Guide Gear long johns for men provide head to toe warmth so each body part is pampered with cozy heat that makes it easy to withstand outdoor cold conditions

MOISTURE WICKING PIECE: This cold weather base layer is intended to collect all sweat and moisture so you stay presentable on the job. Feel dry relief while keeping odor and bacteria at bay

NO ITCH FEEL: Thermal base layer for men is crafted with a tagless neck for itch-free comfort and wear. You can wear it all day with no discomfort or irritation whatsoever

Reliable Heat Retention: Made of cozy waffle-knit fabric, our thermal shirts for men trap and retain body heat within the waffle pockets; A ribbed collar and cuffs help keep the cold out

Soft Cotton Construction: Our men’s thermal long-sleeve shirt is constructed of 100% comfortable

Comfort-Driven Design: Our thermal shirt features a tagless label; Machine-washable men’s waffle-knit long-sleeve shirt won't shrink excessively after washing

Durable, Moisture-Wicking Fabric: Constructed of 85% microfiber performance polyester and 15% spandex, these thermal shirts for men also feature Intellifresh(tm) odor-control on the fabric technology powered by Silvadur(tm)

Athletic Fit: The perfect long-sleeve workout shirts for men, our men’s thermals feature an extended body and sleeves, a tagless design, and flat seams for a smooth, ultra-comfortable fit

Efficient Design: Long-sleeve undershirt for men features a crew neckline and hemmed cuffs with thumbholes for easy layering; Drop tail maintains coverage without restricting freedom of motion

Stay warm and comfortable even in the coldest weather with our selection of outdoor wool products underwear.

Crafted with pure merino wool, this collection of base layer garments is designed to keep you warm and dry no matter what the weather throws your way.

The breathable and moisture-wicking fabric helps regulate your temperature so you stay comfortable all day, while the fit and smooth seams minimize chafing and irritation.

Moisture-Wicking Fabric: Constructed of 100% polyester with a fleece interior for added comfort and warmth, these thermal shirts for men also work to manage moisture by wicking perspiration and drying quickly

Loose Fit: The perfect cold weather long-sleeve shirt for men, our men’s thermals feature a tagless design and flat seams for a smooth, ultra-comfortable fit that offers room for a full range of motion

Efficient Design: Long-sleeve shirt for men features a quarter-zip mock turtleneck and hemmed cuffs; Drop tail maintains coverage without restricting freedom of motion