10 Best Mens Omni Wool Long Underwear of 2025

Tested and Reviewed: Top 10 Mens Omni Wool Long Underwear deals with expert ratings from 8.1 to a perfect 10

April 2026 Edition

Editor's Choice

9.7

Merino.tech

Merino Wool Base Layer Mens Bottom Pants 100% Merino Wool Heavyweight, Midweight, Lite Thermal Underwear Long Johns and Socks (Large, 165 Charcoal Grey)

Editor's bottom line:

“This mens omni wool long underwear is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Lightweight: Mens Merino Base Layer Available in: Lightweight 165 g/m², Midweight 250 g/m², Heavyweight 320 g/m². Merino Wool Hiking Socks ($21 Value!) - Lightweight Merino Wool Pants for Men 165 g/m² and Wool Socks. Cool Packaging! Makes A Great Gift!
Super Soft & Comfortable: 100% Superfine 17.5 Micron Merino Wool Underwear Mens provide all day comfort and no itch! Designed for daily wear without rubbing and overheating of regular cotton.
Moisture Wicking & Odor Resistant: Merino Baselayer Men natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.
Easy Care: Washer/dryer safe. For longer lasting wear, hand wash and air dry. Lightweight Merino Wool Base Layer Mens naturally regulates body temperature to keep you comfortable all year round.
Zero Worries: Every Merino.tech Merino Pants we make is backed by our Merino.tech Promise - ensuring you're 100% happy with every Merino.tech purchase.

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Picked by 397 people today

9.5

Merino.tech

Merino Wool Base Layer Mens Bottom Pants 100% Merino Wool Heavyweight, Midweight, Lite Thermal Underwear Long Johns and Socks (Large, 165 Black)

Main Highlights

Lightweight: Mens Merino Base Layer Available in: Lightweight 165 g/m², Midweight 250 g/m², Heavyweight 320 g/m². Merino Wool Hiking Socks ($21 Value!) - Lightweight Merino Wool Pants for Men 165 g/m² and Wool Socks. Cool Packaging! Makes A Great Gift!
Super Soft & Comfortable: 100% Superfine 17.5 Micron Merino Wool Underwear Mens provide all day comfort and no itch! Designed for daily wear without rubbing and overheating of regular cotton.
Moisture Wicking & Odor Resistant: Merino Baselayer Men natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.
Easy Care: Washer/dryer safe. For longer lasting wear, hand wash and air dry. Lightweight Merino Wool Base Layer Mens naturally regulates body temperature to keep you comfortable all year round.
Zero Worries: Every Merino.tech Merino Pants we make is backed by our Merino.tech Promise - ensuring you're 100% happy with every Merino.tech purchase.

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9.5

Merino.tech

Merino.tech Merino Wool Base Layer Mens Set - Heavyweight, Midweight, Lite Merino Wool Thermal Underwear For Men Top, Bottom (Large, 250 Black)

Main Highlights

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

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9.2

YESWEL

YESWEL 100% Merino Wool Base Layer Mens, Soft Thermals Underwear, Top and Bottom Set，Warm Long Johns Sets for Winter Ski (Black, M)

Main Highlights

100% MERINO WOOL 180g/m²: This merino wool base layer mens includes winter long johns and sleeved shirt made from 100% merino wool, which prevents annoying static electricity
SOFT and BREATHABLE: This thermal underwear for men is soft and smooth, fitting snugly against the skin without itching, providing a smooth wearing experience
MOISTURE WICKING: The merino wool in this top and bottom set is moisture-wicking and breathable, keeping you dry and warm
EASY CARE: This ski base layer is easy to maintain. It retains its shape and elasticity even after numerous washes without losing quality
WINTER CHOICE: This men's merino Activewear is suitable for lounging, running, hiking, ski, hunting outdoors, and indoor fitness training. It's your ideal choice

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9.0

BAMBOO COOL

Men's Heavyweight Thermal Underwear Long Johns Bottom with Soft Wool Lining, Warm Base Layer Pants for Cold Weather

Main Highlights

Ultimate Winter Thermal Protection: Our men's Heavyweight long johns set includes two pairs of thermal pants, delivering full-body warmth. Featuring soft, moisture-wicking lining, this set maintains dryness and comfort even in extreme coldperfect for winter sports and outdoor adventures.
Breathable Comfort: These heavyweight thermal underwear bottoms utilize 11% wool-blend materials for superior breathability and skin dryness. The temperature-regulating fabric makes them ideal for cycling, skiing, climbing, running, snowboarding, yoga, and fitness training.
Ultra-Soft & Stretch Fabric: Designed with 4-way stretch technology, these men's comfortable thermal underwear ensure unrestricted movement. Reinforced seams prevent premature tearing, offering durability without compromising warmth or mobility.
Versatile Design for Men: Perfect as a base layer under formal/casual attire or as cozy sleepwear on cold nights. Wear them discreetly under clothing for added insulation in harsh weather.
Easy Care & Guaranteed Satisfaction: Machine-washable for effortless maintenance. Backed by hassle-free returns and dedicated customer support.

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8.8

LAPASA

LAPASA Men's 100% Merino Wool Underwear Base Layer Lightweight Thermal Pants Activewear Long John Bottom Warm Soft Winter M30 Medium Black-Lightweight

Main Highlights

100% MERINO WOOL: LAPASA's long john thermal underwear pants are made from 100% Merino Wool, providing the ultimate warmth and comfort for cold weather. The Lightweight and Midweight fabric ensures superior insulatio. Also, The merino fibers offer a soft, itch-free experience. It's an ideal base layer for winter activities like hunting, camping, or as cozy pajamas.
OPTIMAL INSULATION AND BREATHABILITY: Enjoy the perfect balance of warmth and breathability with LAPASA's Merino wool thermal underwear bottom. The mid-thickness design provides excellent insulation without bulkiness, offering a lightweight and comfortable feel. The breathable fabric wicks away moisture, keeping you dry and cozy during outdoor adventures or everyday wear.
UNRESTRICTED MOVEMENT AND VERSATILITY: Our merino thermal pants moves with your body, thanks to the durable 4-way stretch material, ensuring freedom of movement during various activities. It's perfect for hiking, skiing, or any cold-weather pursuits. The snug fit and seamless construction prevent chafing and enhance comfort.
NATURAL CONTROL AND COOLING + WARM EFFECT: LAPASA's Merino wool base layers keep you fresh throughout the day. The natural cooling properties of Merino wool make it suitable for any season or climate, allowing you to stay comfortable and cool even in warmer temperatures.
LIGHTWEIGHT AND EASY CARE: Our lightweight Merino wool thermal long john boxer pants offers excellent heat retention while being easy to care for. It's machine washable and quick-drying, ensuring hassle-free maintenance. Whether you're heading out for an adventure or lounging at home, this thermal set provides exceptional comfort and performance.

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8.6

Merino.tech

Merino.tech Merino Wool Underwear Mens - 100% Merino Wool Base Layer Boxer Briefs for Men (Small, 1 Pack - 190 Black Coal)

Main Highlights

Super soft & Comfortable: 100% Superfine 18.5 Micron merino wool underwear for men provide all day comfort and no itch! Designed for daily wear without rubbing and overheating of regular cotton.
Breathable: Keeping you cool in summer and warm in winter, these merino boxer briefs fit snuggly and provide gentle support. Great to use with winter sports gear, and as an extra layer in cold weather.
Moisture Wicking & Odor Resistant: Merino mens boxer briefs natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.
Easy Care: Wash on delicate cycle. For longer lasting wear hand wash and air dry. Lightweight merino wool underwear men boxer brief naturally regulates body temperature to keep you comfortable all year round.
Zero Worries: Every merino briefs men we make is 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.

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8.3

Icebreaker Merino

icebreaker Merino Wool 175 Everyday Men’s Cold Weather Leggings with Fly - Thermal Underwear for Men with Contoured Slim Fit - 100% Merino Wool Base Layer - Premium Long Johns - Black - Large

Main Highlights

Second Skin Wool Leggings: Harness natural performance with the Icebreaker Merino Everyday 175 Long Warm Leggings and Mens Undergarments! These insulated long johns for men are the perfect foundation for an everyday cold weather men base layer.
Reliable Performance: The ideal warm leggings for men, this 100% Merino wool base layer for mens use is ready for any active day! Our mens long underwear is naturally odor-resistant, and will keep you warm when its cold and cool when its warm.
Always the Perfect Fit: Perfect for summer nights at camp or a winter adventure, these warm mens leggings have a contoured, slim fit for smooth layering. Our mens thermals and winter pants for men are super soft and will help to manage moisture!
Designed for Comfort: With ribbed fabric for stretch, our mens winter leggings and Merino wool thermal underwear have a gusset design for mobility, a contoured pouch with a functioning fly, flatlock seams to reduce chafing, and an elastic waistband.
Inspired by Nature: At Icebreaker Merino, we believe in creating a relationship between people and nature, and our long underwear and thermal clothes for men are designed to provide natural performance with quality materials over synthetic fiber.

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8.1

Merino Protect

Merino Protect 100% Merino Wool Base Layer Men Thermal Long Underwear Heavyweight Soft Long Johns for Hunting Hiking

Main Highlights

Trusted Warmth for Cold Weather: Our 250g heavyweight merino wool base layer mens lock in body heat, providing warmth that synthetic fibers cannot match. Stay cozy and comfortable with warmth at every step, even in truly cold weather.
Moisture-Wicking: The natural moisture-wicking properties of Merino wool ensure that these merino wool underwear men absorb and evaporate excess sweat during cold-weather activities, keeping you warm and dry without losing body heat.
Odor Resistant: With natural odor-resistant properties, these merino wool thermal underwear prevent unpleasant smells even after extended wear. Lighter and more breathable than thick cotton pants, theyre perfect for long trips or extended outdoor activities, keeping you fresh and comfortable.
Soft & Comfortable: Made from 100% pure Australian Merino wool, these mens merino wool base layer are softer than cotton, with ultra-fine fibers that are breathable, non-itchy, and provide all-day comfort with freedom of movement.
Customer Service: Backed by a 6-month warranty. If you have any issues, please feel free to contact us. For best care, we recommend cold, gentle machine washing and air drying; avoid heat or tumble drying. (250g/18.5 microns)

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8.1

Icebreaker Merino

icebreaker Merino Wool 175 Everyday Men’s Cold Weather Leggings - Thermal Underwear for Men with Contoured Slim Fit - 100% Merino Wool Base Layer - Premium Long Johns, X-Large, Black/Monsoon

Main Highlights

Cold-Weather Layering Foundation: Stay warm and comfy all year long with the Icebreaker Merino Standard 175 Warm Leggings for men! These insulated long johns for men are thermal to regulate body temperature, and match our Everyday Zip or LS crew top.
Reliable Materials: Made with 100% Merino wool, these warm mens leggings are super-soft, and our winter pants for men naturally resist odor and manage moisture. This Merino wool base layer will keep you cool when its hot and warm when its cold.
Perfect Everyday Fit: Designed with a slim, contoured fit to help provide smooth cold weather layers, our mens long underwear and mens thermals are perfect whether youre camping on a chilly summer night or enjoying a frigid winter adventure!
Always Stay Comfortable: This Merino wool underwear for men and mens winter leggings feature ribbed fabric for stretch and comfort, a brushed elastic waistband for an easy fit, and flatlock seams to reduce chafing for all-day dependability.
Inspired by Nature: At Icebreaker Merino, we believe in creating a relationship between people and nature, and our long underwear and thermal clothes for men are designed to provide natural performance with quality materials over synthetic fiber.

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Our Best Overall Choice

Best Choice

9.7

Merino.tech

Merino Wool Base Layer Mens Bottom Pants 100% Merino Wool Heavyweight, Midweight, Lite Thermal Underwear Long Johns and Socks (Large, 165 Charcoal Grey)

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Lightweight: Mens Merino Base Layer Available in: Lightweight 165 g/m², Midweight 250 g/m², Heavyweight 320 g/m². Merino Wool Hiking Socks ($21 Value!) - Lightweight Merino Wool Pants for Men 165 g/m² and Wool Socks. Cool Packaging! Makes A Great Gift!
Super Soft & Comfortable: 100% Superfine 17.5 Micron Merino Wool Underwear Mens provide all day comfort and no itch! Designed for daily wear without rubbing and overheating of regular cotton.
Moisture Wicking & Odor Resistant: Merino Baselayer Men natural wicking and odor-resistant properties allow it to absorb moisture better than any other fabric, keeping you dry and fresh.
Easy Care: Washer/dryer safe. For longer lasting wear, hand wash and air dry. Lightweight Merino Wool Base Layer Mens naturally regulates body temperature to keep you comfortable all year round.
Zero Worries: Every Merino.tech Merino Pants we make is backed by our Merino.tech Promise - ensuring you're 100% happy with every Merino.tech purchase.

Show Price

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