Best S 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

Check the size chart of the third picture to select the appropriate size

4-way stretch construction moves better in every direction, tight fitting,like a second skin

Moisture Transport System sweeps away sweat and dries quickly; Flat lock seams to prevent 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.

Quick dry and breathable fabric. Won't deform and fade, as mild as the second skin. Keep cool in summer, stay dry and warm in winter, excellent for outdoor sports

2 side pockets provide the convenience of carrying essentials for outdoor sports; wide waistband for optimal coverage and the 4 way stretch fabric for mobility in any direction, more flexible and cool dry in training

Aesthetic part of your workout and optimize your performance. Leggings provided excellent protection from the sun, the flatlock seams against abrasions and make it more durable

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

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.

Lightweight & Breathability: Men's athletic hiking Shorts are made quality 4-Way Stretch/breathable and quick-drying fabric helps to wick away moisture and dry quickly keep you cool. A synthetic of polyester and spandex can be very durable, abrasion-resistant, and stretchy enough to allow for better mobility.

UNIQUE: Exercise cool Shorts have stylish casual breathable holes on both sides, designed exclusively by NORTHYARD. Soft Elastic waistband/ built-in adjustable drawstring for custom fit, flatlock seams reduce chafe for additional comfort and ease of movement.Two stylish reflective strips at the front and back allow you to improve safety in low-light situations.

3 Zipper Pockets: Men's athleisure unlined Shorts feature conveniently placed and easily accessible pockets so that you can quickly store and retrieve your items. The 2 side and 1 back pockets with zipper offer easy storage for your essentials and are also deep enough to prevent the items from falling out during activities.

MIDWEIGHT — Mens Merino Wool Base Layer set Available in: Lightweight = 165 g/m², Midweight = 250 g/m², Heavyweight = 320 g/m². FREE MERINO WOOL HIKING SOCKS ($21 VALUE!) – Package includes Merino wool Midweight base layer mens top and wool men long johns 250 g/m² + Merino Wool Hiking Socks. 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! 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.

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

OMNI-WICK: The ultimate moisture management technology for the outdoors. Omni-Wick quickly moves moisture from the skin into the fabric where it spreads across the surface to quickly evaporate—keeping you cool and your clothing dry.

ADVANCED TECHNOLOGY: Columbia Men's Thistletown Park Raglan Shirt features our signature UPF 15 sun protection fabric that helps to blocks harmful UVA and UVB rays as well as wicking technology to help keep you dry and cool on the trail.

CLASSIC FIT: Designed for fall and winter wear, this long sleeve T-Shirt is made for easy fit and comfortable range of motion.

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.

Fast dry wicks away sweat and fights odor

Rugged flex technology for ease of movement

Smooth flat lock seams and tag less label enhance comfort

[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.

What You Get: Terramar Sports Thermasilk Women's Scoop top comes in Black, Natural and Grey options and in the following sizes: Small, Medium, Large and X-Large. Made from 100% pure silk, they feel extremely smooth and keep you warm

These shirts are very light weight and do not have additional bulk and made with our ClimaSense treatment to neutralize s, regulate your body temperature and wick away any sweat

Features: Thermoregulation Comfort Technology to regulate your body's natural temperature and keep your hands warm. It is built to stretch so there is no irritation or bunching

Stretch fleece panels at Underarm and side body

New custom zipper collection

Brushed microfiber inner collar

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.

Champion Shirt Quality Fabric: Soft, lightweight, cotton blend fabric; keep you cool, dry and moving comfortably during your workout. The Champion shirts for men are machine washable.

Champion Crewneck Features: The casual wardrobe-essential men shirts feature crew neck, short sleeves. There are 2 pack workout shirts for you; you can choose to wear different color and style.

Muscle Shirts For Men Occasions: The mens workout shirt is perfect for sports and training activities, such as yoga, bicycling, running, playing basketball, football, weight lifting, etc.

WARM HEAVYWEIGHT base layer for extreme cold activities

SUSTAINABLY CRAFTED from 100% recycled, ECO-friendly fibers

ZEROSCENT ANTI-ODOR technology engineered into the fabric helps you stay fresh

Special one leg cutting design, dynamic and unique non-symmetrical design.

Made of polyester and spandex, ultra-soft ,comfort, keep good feeling in exercise.

Grip your muscle tightly, shape the body and protect the muscles well in active exercise.

Men's training tee for everyday wear

Crewneck provides full coverage

Long back hem helps keep shirt tucked in

Quick dry technology

Lightweight flexible and durable

Crew neck construction

Cooling: Made from 6-channel Coolmax polyester and elastane, this sleeveless tee is designed to cool your body 6 degrees

Breathable: Large-hole mesh construction makes this sleeveless base layer light, airy and cooling

Moisture-Wicking: Quick-drying, moisture-wicking polyester performance fabric keeps you cool and dry during intense workouts in the summer heat

Lightweight single layer engineering with an exceptionally soft feel

Best used as a base layer for low bulk layering in cold to very cold weather and medium to high activity levels

Flat Seams and Tagless with Front and Back Rise

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

LIGHTWEIGHT Polo – Package includes Merino.tech Merino Wool Polo Shirts For Men Lightweight 165 g/m². Our merino wool shirt fulfills a gap between everyday technical apparel & luxurious leisurewear.

SUPER SOFT & COMFORTABLE – 100% Superfine 17.5 Micron Merino mens wool polo provide all day comfort and no itch! Designed for daily wear without rubbing and overheating of regular cotton.

MOISTURE WICKING & ODOR RESISTANT – merino wool shirt men natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.

Men's lightweight t-shirt for sports training and workouts

Made from water-absorbent materials designed to wick moisture away from your body, adidas AEROREADY keeps you feeling dry as you move

Ribbed crewneck holds its shape