10 Best Mens Merino Thermal Leggings in The UK
Last updated on 06/09/2025
Advertising disclosure
Advertising disclosure
Best Choice
1
Merino.tech Merino Wool Base Layer Men Set - Merino Thermal Underwear Mens Top and Bottom Lightweight, Midweight, Heavyweight (X-Large, 320 Black)
Merino.tech
Free Shipping
Merino.tech
Merino.tech Merino Wool Base Layer Men Set - Merino Thermal Underwear Mens Top and Bottom Lightweight, Midweight, Heavyweight (X-Large, 320 Black)
Free Shipping
Why We Love It
- Includes Bonus Hiking Socks.
- Super Soft & Comfortable.
- Moisture Wicking & Odor Resistant.
Main Highlights
- Heavyweight - Merino Wool Base Layer men set Available in: Lightweight = 165 g/m², Midweight = 250 g/m², Heavyweight = 320 g/m². Merino Wool Hiking Socks ($21 Value!) – Package includes Merino wool Heavyweight base layer mens top and wool long johns 320 g/m² + Merino Wool Hiking Socks. Makes A Great Gift!
- Super Soft & Comfortable – 100% Superfine 19.5 Micron Merino Base Layer Men Set provides all day comfort and no itch! Designed for daily wear without rubbing, overheating, or bunching of regular cotton.
- Moisture Wicking & Odor Resistant – Wicking and odor-resistant properties of Thermal Merino Wool Underwear men 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. Merino Wool Long Johns sets for men regulate body temperature to keep you comfortable all year round.
- Zero Worries: Every Merino.tech mens merino base layer top 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.
Value for Money
2
Men's Merino Baselayer Set (LS Shirt + Tights) L Black 1-pack
DANISH ENDURANCE
Free Shipping
DANISH ENDURANCE
Men's Merino Baselayer Set (LS Shirt + Tights) L Black 1-pack
Free Shipping
Why We Love It
- Optimal temperature control merino.
- Ideal for outdoor activities.
- Recommended by elite athletes.
Main Highlights
- TEMPERATURE CONTROLLED MERINO: Our lightweight base layer set features a premium merino blend that provides breathability, temperature control, and moisture wicking to keep you fresh and dry all day long. Soft itch-free material, no neck tags and flat seams ensure maximum comfort. Suitable for sensitive skin
- 'IDEAL FOR OUTDOOR & EVERYDAY: Our versatile merino base layer set is made from a antibacterial and odor-free blend and is a great choice for staying nice and comfortable in any weather. Perfect for outdoors, be it for workouts, hiking or winter sports. For casual wear, our merino set will also keep you cozy at home
- DESIGNED IN DENMARK: Our Danish Endurance design team develops this regular fit set in Copenhagen, Denmark. The set is OEKO-TEX standard 100 certified to ensure it is free from harmful substances. The merino wool is sourced in an animal-friendly way without mulesing practices
- RECOMMENDED BY EVEREST CLIMBER AND ELITE ATHETE: Our merino base layer line is developed with mountaineer Rasmus Kragh, the first Dane to climb Mount Everest without the use of supplemental oxygen in May 2019. During his training and excursions, Rasmus is continuously testing our products to ensure the highest standards of performance and material endurance
- EXCELLENT CUSTOMER SUPPORT: We want our customers to be happy - In case you have any questions or issues, do not hesitate to contact us. Our customer service team is always ready to help you and find the best solution for you
3
Merino Wool Base Layer Men Leggings Pants 100% Merino Wool Thermal Underwear Long Johns Light, Mid, Heavyweight + Hiking Socks (Large, Black 250)
Merino.tech
Free Shipping
Merino.tech
Merino Wool Base Layer Men Leggings Pants 100% Merino Wool Thermal Underwear Long Johns Light, Mid, Heavyweight + Hiking Socks (Large, Black 250)
Free Shipping
Why We Love It
- Incredible Comfort and No Itch.
- Moisture Wicking and Odor Resistant.
- Lifetime Warranty Included.
Main Highlights
- Midweight – Mens Merino Base Layer Available in: Lightweight = 165 g/m², Midweight = 250 g/m², Heavyweight = 320 g/m². Merino Wool Hiking Socks ($21 Value!) – Package includes Merino Wool Pants Men Midweight 250 g/m² + Merino Wool Hiking Socks. Cool Packaging! Makes A Great Gift!
- Super Soft & Comfortable – 100% Superfine 18.5 Micron Merino Wool Underwear Men provide all day comfort and no itch! Designed for daily wear without rubbing and overheating of regular cotton.
- Moisture Wicking & Odor Resistant – Merino Base Layer Men 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 long johns for Men regulates body temperature to keep you comfortable all year round.
- Zero Worries: Every Merino.tech Merino long johns 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.
4
Smartwool Classic All-Season Men's Thermal Leggings, Merino Wool Bottoms, Long Johns & Thermal Trousers, Running Tights & Ski Pants Base Layer, Breathable Natural Men's Clothing - Grey, L
Smartwool
Free Shipping
Smartwool
Smartwool Classic All-Season Men's Thermal Leggings, Merino Wool Bottoms, Long Johns & Thermal Trousers, Running Tights & Ski Pants Base Layer, Breathable Natural Men's Clothing - Grey, L
Free Shipping
Why We Love It
- Thermal technology for year-round comfort.
- Soft, durable, and breathable fabric.
- Chafe-free design enhances performance.
Main Highlights
- Smartwool thermal leggings: Men's baselayer soft stretch compression tights, with slim designed to follow the contours of the body, with comfy wide merino-covered waistband
- Maximum comfort: Lightweight merino jersey fabric uses a recycled nylon core to increase durability while keeping super-soft 100% ZQ-certified merino wool yarn next to skin
- Premium performance: Men's sports leggings with flatlock seam construction designed to minimise chafing, plus side seams wrap to front for body-enhancing fit
- Ideal for all seasons: Ultra-smooth merino helps regulate body temperature, breathes well, and naturally resists odours. Great for under ski trousers or combat trousers
- Go Far. Feel Good. Complete your winter wardrobe and create a cosy thermal layering system with Smartwool's merino wool technology, for ultimate all-season comfort all day long
5
Brass Monkeys - 100% Merino Wool - Made in New Zealand - Mens Long Johns Thermal Pants V2 - All Black, Large
Brass Monkeys
Free Shipping
Brass Monkeys
Brass Monkeys - 100% Merino Wool - Made in New Zealand - Mens Long Johns Thermal Pants V2 - All Black, Large
Free Shipping
Why We Love It
- Natural and Ethically Made.
- Optimum Comfort and Warmth.
- Odor Resistant, Itch-Free.
Main Highlights
- Introducing the variation to our Brass Monkeys merino long johns. Redesigned based on customer feedback, we have kept the same waist dimentions and increased the leg space slightly to give a tad more room for movement. Similar to the original merino long johns from Brass Monkeys, these leggings are made in New Zealand with 100% pure merino wool.
- 🌏 ETHICALLY MADE IN NEW ZEALAND & 100% NATURAL: All our underwear is made from 100% renewable, eco-friendly Merino wool that is ethically sourced from farms that follow high standards of animal welfare and environmental protection. New Zealand’s home made merino: No sweatshops, just natural comfort in every stitch.
- 🤗EXTREMELY COMFORTABLE: All our wool is sourced based on its softness and durability. Merino wool is breathable yet able to adjust your body temperature and provide warmth without over heating. Our long john mens leggings are perfect for wearing day to day.
- ✅ ITCH FREE AND ODOUR RESISTANT: Whether skiing, hiking, running, at work or simply relaxing, our incredibly soft leggings keep you in the moment. No itch, with fibres that are up-to five times thinner than the human hair. No stink, Merino's moisture wicking and anti-bacterial properties keep your body performing at its optimum temperature and feeling fresh, even after multiple wears.
- 🐑 FABRIC & TECHNICAL DETAILS: Our base layer long johns are made from 100% Pure Merino Wool, with the perfect all-year-round warmth weight of 215 g/m² jersey knit. These leggings are perfect for sensitive skin. Made with ultra-fine 19 micron Merino wool, there's none of the itch of regular cotton or sweat rash found with un-natural polyesters or blended fabrics.
- ❤️🔥ULTRA WARM: Lightweight & luxurious, our Merino wool long johns retain heat to the same capacity as bulkier garments at a fraction of the weight. This winter, our leggings are the perfect base layer for men, either for your outdoor activities or to save on heating bills.
6
Smartwool Classic Baselayer Men's Thermal Leggings, Merino Wool Bottoms, Long Johns & Thermal Trousers, Running Tights & Ski Pants Base Layer, Breathable Natural Men's Clothing - Black, L
Smartwool
Free Shipping
Smartwool
Smartwool Classic Baselayer Men's Thermal Leggings, Merino Wool Bottoms, Long Johns & Thermal Trousers, Running Tights & Ski Pants Base Layer, Breathable Natural Men's Clothing - Black, L
Free Shipping
Why We Love It
- Ultimate comfort and warmth.
- Durable and soft materials.
- Perfect for all seasons.
Main Highlights
- Smartwool thermal leggings: Men's baselayer soft stretch pants, with slim designed to follow the contours of the body, with comfy wide merino-covered waistband
- Maximum comfort: Lightweight merino jersey fabric uses a recycled nylon core to increase durability while keeping super-soft 100% ZQ-certified merino wool yarn next to skin
- Premium performance ski or men's running trousers: Men's sports leggings with flatlock seam construction and an interlock knit, designed to minimise chafing
- Ideal for all seasons: Ultra-smooth merino helps regulate body temperature, breathes well, and naturally resists odours. Great for under ski trousers or combat trousers
- Go Far. Feel Good. Complete your winter wardrobe and create a cosy thermal layering system with Smartwool's merino wool technology, for ultimate all-season comfort all day long
7
Icebreaker 100% Merino Wool Baselayer, Men's Leggings, Everyday Gym Leggings, For Workouts and Sports - Black / Monsoon, XL.
icebreaker
icebreaker
Icebreaker 100% Merino Wool Baselayer, Men's Leggings, Everyday Gym Leggings, For Workouts and Sports - Black / Monsoon, XL.
Why We Love It
- Moisture-wicking and super-soft.
- Regulates temperature year-round.
- Natural and odor-resistant fabric.
Main Highlights
- 100% Merino Wool
- Updated design for premium comfort and fit
- Stretchy rib merino that moves effortlessly with you
- Naturally odor resistant
8
woolcano 100% Merino Wool Thermal Underwear Mens Long Johns for Men Thermal Mens Leggings Base Layer Skiing Skating Running Dark Blue L
woolcano
15% OffFree Shipping
woolcano
woolcano 100% Merino Wool Thermal Underwear Mens Long Johns for Men Thermal Mens Leggings Base Layer Skiing Skating Running Dark Blue L
15% OffFree Shipping
Why We Love It
- Ultimate warmth in cold conditions.
- Breathable fabric keeps you dry.
- Luxuriously soft for all-day comfort.
Main Highlights
- Ultimate Warmth: Crafted from 100% Merino wool, these thermal leggings are engineered to trap body heat, providing superior warmth even in the coldest conditions.
- Breathable Performance: The breathable fabric effectively wicks moisture away from your skin, ensuring you stay dry and comfortable during intense activities, whether you're hitting the slopes or going for a run.
- Soft and Comfortable Fit: The luxurious softness of Merino wool ensures a snug yet comfortable fit, making these long johns perfect for all-day wear without irritation or discomfort.
- Versatile for Any Activity: Ideal for a range of winter sports and activities, WOOLCANO thermal leggings can be worn as a base layer under your ski gear, activewear, or even for casual outings.
- Easy Care and Durability: Designed to withstand the rigors of outdoor use, these leggings are easy to care for and maintain their shape and performance, ensuring long-lasting comfort and functionality.
9
Men’s LIFA® Merino Midweight 2-in-1 Base Layer Pants
Helly Hansen
37% OffFree Shipping
Helly Hansen
Men’s LIFA® Merino Midweight 2-in-1 Base Layer Pants
37% OffFree Shipping
Why We Love It
- Perfect for cold weather activities.
- Offers warmth and comfort.
- Non-itch with flat seams.
Main Highlights
- A distinct 2-in-1 base layer with 100 Percent merino wool exterior and 100 Percent LIFA stay warm technology interior
- Lifa merino midweight is ideal for any type of activity in cold weather
- A 2-in-1 base layer with 100 Percent merino wool combined with Lifa stay warm technology in a two layer construction
- LIFA merino midweight delivers all the ideal benefits of merino wool fibers plus the distinct properties of technical LIFA fibers
- Two layer construction, 100 Percent merino wool exterior, 225 g LIFA merino fabric, non-itch, flat lock seams
10
Helly Hansen Men's Lifa Merino Midweight 3/4 Pants, Black, Medium
Helly Hansen
Free Shipping
Helly Hansen
Helly Hansen Men's Lifa Merino Midweight 3/4 Pants, Black, Medium
Free Shipping
Why We Love It
- Soft, warm, and comfortable fit.
- Ideal for cold weather activities.
- Durable two-layer construction design.
Main Highlights
- A distinct 2-in-1 base layer with 100 Percent merino wool exterior and 100 Percent LIFA stay warm technology interior
- Lifa merino midweight is ideal for any type of activity in cold weather
- A 2-in-1 base layer with 100 Percent merino wool combined with Lifa stay warm technology in a two layer construction
- LIFA merino midweight delivers all the ideal benefits of merino wool fibers plus the distinct properties of technical LIFA fibers
- Two layer construction, 3/4 length, 100 Percent merino wool exterior, 225 g LIFA merino fabric, non-itch, flat lock seams