Top 10 Longsleeve Under Shirts for Men UK – Men’s Thermal Tops

As an Amazon Associate I earn from qualifying purchases.

1. 32º DEGREES

#ad

S, 32 Degrees Men’s Heat Performance Thermal Heavyweight Baselayer Crewneck Long Sleeve Fleece Top, Stingray

#ad
32º DEGREES #ad - Meant to be fitted to accommodate wearing under clothes. Fitted: please refer to photo size chart for chest, hips, waist, and length measurements.

Wash care: wash cold gentle cycle with like colors, Do Not Dry Clean, Non-Chlorine Bleach Only, Tumble Dry Low, Iron Cool if needed. Soft micro-fleece on the outside, brushed for extra comfort on the inside. Offers full mobility and freedom of movement. Perfect for everyday comfort at home and winter outdoor activities. Midweight fleece with a lot of stretch. Fabric: 94% polyester, 6% spandex. The thermal underwear can be worn as comfy loungewear on cold, chilly nights. Features: quick dry, anti-static, 4-way stretch, soft fleece, fitted, heavyweight, Tag Free Label.
Brand32º DEGREES #ad
Manufacturer32 Degrees #ad
Weight0.46
Part Number#4302
Model#4302

2. MERIWOOL

#ad

100% Merino Wool Midweight Long Sleeve Thermal Shirt Black, MERIWOOL Mens Base Layer

#ad
MERIWOOL #ad - Breathable: keeping you cool in summer and warm in winter, 250g/m2 weight interlock-knit Merino wool can be used as a base layer or mid-layer, snowboarding, hunting, skiing, working, playing sports, hiking, but won’t weigh you down. Wicking refers to a fabric’s ability to pull moisture away from your body and keep you comfortable.

Package includes: 1 – merino wool men’s merino wool thermal crewneck top in Black / Medium | MATERIAL: 18. 5 micron, 100% merino wool, 250g/m2 | FIT: Fitted. Through the process of wicking, Merino wool is the most breathable fabric and absorbs moisture better than any other fibers. Exceptional customer care: if your meriwool men’s midweight base layer crew top doesn’t perform to your satisfaction, exchange, return it to us within 30 DAYS along with proof of purchase for a hassle-free refund, or replacement. Wicking & odor resistance: merino wool’s natural wicking and odor-resistant properties keep you dry and comfortable while active in cold weather.

Includes a 90 dAY limited manufacturer’s warranty. Comfortable & convenient: Quick-drying shirt features a loop for hang drying while camping, or partaking in any outdoors activity. Super soft: 100% all natural superfine 18. 5-micron merino wool ensures comfort all day – no itch! EASY CARE: Mid-weight long sleeve crew top shirt is machine-washable and dryer-safe, so it’s ready when you are for your next adventure.
BrandMERIWOOL #ad
ManufacturerMERIWOOL #ad
Part NumberLYSB01N1IVTGC-SPRTSEQIP
ModelCrewneck

3. 32 Degrees

#ad

32 DEGREES Men's 2-Pack Performance Lightweight Thermal Baselayer Crewneck Top, Large, Black/Black

#ad
32 Degrees #ad - The acrylic blend adds additional lightweight warmth that is comfortable against the body. Meant to be fitted to accommodate wearing under clothes.

Fabric: 40% polyester, 22% rayon, 34% acrylic, 4% spandex. Fitted: please refer to photo size chart for chest, and length measurements. Features: lightweight, anti odor, Moisture wicking, 4 Way Stretch, anti-static, Tag Free Label. Wash care: wash cold gentle cycle with like colors, Non-Chlorine Bleach Only, Tumble Dry Low, Do Not Dry Clean, Iron Cool if needed. Lightweight knit with a lot of stretch. Perfect for running, hips, waist, skiing, hiking, hunting.
Brand32 Degrees #ad
Weight0.35 kg (0.77 Pounds)
Part Number#9002
Model#9002

4. 32 Degrees

#ad

L, Black, 32 DEGREES Mens Heat Performance Thermal Baselayer Crewneck Long Sleeve Top

#ad
32 Degrees #ad - Features: moisture wicking, Anti Static, 4 Way Stretch, anti Odor, Tag Free Label. Fitted: please refer to photo size chart for chest, hips, waist, and length measurements. Fabric: 40% polyester, 22% Rayon, 34% acrylic, 4% Spandex. Meant to be fitted to accomdate wearing under clothes.
Brand32 Degrees #ad
Manufacturer32 Degrees #ad
Part Number#9002
Model#9002

5. X-Bionic

#ad

X-Large, X-Bionic Energizer 4.0 Shirt Round Neck Long Sleeves Men Baselayer Functional Sport T-Shirt, Opal Black/Arctic White

#ad
X-Bionic #ad - With its moderate compression, the round neck t-shirt for Men fulfils all the wishes of demanding winter sports enthusiasts who want outstanding wearing comfort and optimizing thermoregulation.

The result is an ultra-dense knitted fabric that integrates 13 highly effective technologies. The legendary patented 3d bionic Sphere System with thermosiphon technology is more powerful than ever: cool when you sweat, and warm when you are cold. The air complex-zone on the upper abdomen and the Air-conditioning Channel with surrounding air Guides support temperature-controlled ventilation under a second layer of Clothing.

100% research, design and communication done in switzerland, made in Italy. The functional underwear is manufactured on precision machines using the pioneering Retina process. More than 600 awards and test wins, development, over 800 patent registrations worldwide for the brand with the "X".
BrandX-Bionic #ad
ManufacturerX-BIONIC #ad
Weight0.62
Part NumberNG-YT06W19M
ModelNG-YT06W19M

6. MERIWOOL

#ad

MERIWOOL Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men, Medium, Navy

#ad
MERIWOOL #ad - 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. 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, playing sports, hiking, skiing, whether your camping, hunting, or partaking in any outdoors activity.

Exceptional customer care: if your meriwool men’s heavyweight baselayer crew doesn’t perform to your satisfaction, exchange, return it to us within 30 DAYS along with proof of purchase for a hassle-free refund, or replacement. Wicking refers to a fabric’s ability to pull moisture away from your body and keep you comfortable.

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. Package includes: 1 – men’s merino wool thermal crewneck top in navy / medium | MATERIAL: 18. 5 micron, 100% merino wool, 400g/m2 | FIT: Fitted. Includes a 90 dAY limited manufacturer’s warranty. Wicking & odor resistance: merino wool’s natural wicking and odor-resistant properties keep you dry and comfortable while active in cold weather.
BrandMERIWOOL #ad
ManufacturerMERIWOOL #ad
Height10.16 cm (4 Inches)
Length24.13 cm (9.5 Inches)
Width12.07 cm (4.75 Inches)

7. Merino Wool

#ad

100% Merino Wool Mid Layer, Large, Minus33 Mens Long Sleeve Expedition Mock Neck, Warm Under Shirt, Black

#ad
Merino Wool #ad - The 100% australian merino wool is soft next to the skin and makes a great base layer, or it can be worn by itself when you attended your next stylish dinner party. No amount of snow keeps us down, plain and simple. Quality long sleeve mock neck: just like our rogers mock neck, but warmer! this Expedition Mock Neck is the perfect base layer when temperatures drop.

Technical details: 100% 18. 5 micron merino wool long sleeve mock Neck 400 G/M2, Regular Fit, Mid Layer, Rating 50+. Experienced brand: although there are many copy-cats on the market today, and everything else in between since we were kids. We see it all from beautiful fall leaves, camping, skiing, to colorful springs and summers. Wear this to: go hunting, skiing, to work, snowboarding, snowmobiling, or just as casual wear.

We are committed to bringing you the best Merino Wool products at a reasonable price. We’ve been hiking, snowy winters, Minus33 has been a trusted brand since 2004. This is perfect if you don't want too much bulk around your neck but are looking for that extra warmth. Imported: as the legacy of a 100+ year old usa based woolen company, Minus33 knows quality and comfort in Merino Wool. This expedition piece can be worn when the weather is anywhere between 30 degrees and below zero.
BrandMerino Wool #ad

8. MERIWOOL

#ad

Gray, XL, MERIWOOL Men’s Base Layer Hoodie Lightweight Merino Wool Long Sleeve Thermal

#ad
MERIWOOL #ad - 4 season comfort: whether you’re hunting, hiking or fishing, our long-sleeve thermal t-shirt helps regulate body temperature! The hood and thumb holes offer added warmth in chilly weather, while the half-zip design keeps you cool when things heat up. Material: 16. 5 micron, 190g/m2. Lightweight and versatile: made with a 16.

5 micron jersey knit, our athletic sweater is super-soft with no itch! Wear it as a base layer outdoors under a coat or jacket, or wear it solo indoors for cozy lounging. Stay acitve, 100% merino wool, our performance half-zip hoodie is quick-drying and ultra-breathable! Great for running, STAY DRY: Designed with athletes in mind, sports or the gym, it pulls sweat away from the skin without chaffing, irritation or restricting movement. Satisfaction guarantee: design details like a zipper garage and reflective material take our hooded shirt to the next level! If for any reason you don’t love it, purchase is backed by our full 90-day guarantee and a 1-year manufacturer’s warranty.

Naturally odor-resistant: merino wool’s natural wicking and odor-resistant properties keep you dry and comfortable while active in cold weather. Includes: 1 – merino wools men’s base layer hoodie lightweight long-sleeve thermal. Through the process of wicking, Merino wool is the most breathable fabric and absorbs moisture better than any other fibers. Wicking refers to a fabric’s ability to pull moisture away from your body and keep you comfortable. It’s a must-have in any man’s closet.
BrandMERIWOOL #ad
ManufacturerMERIWOOL #ad
Part NumberMO MEN-ZIPHOOD190-XL-CHGRY

9. DEVOPS

#ad

- L, DEVOPS 2 Pack Men's Thermal Turtle Mock Neck Shirts, Compression Long Sleeve Tops

#ad
DEVOPS #ad - Versatile performance thermal Tops with ultra soft hand feel and heat-retention is a perfect option during various indoor activities, outdoor excursion and recreational activities. Easy care Machine Washable. 90% polyester, 10% Spandex. Ultra soft & warm thermal tech fleece fabric of the baselayer caresses the skin so naturally providing maximum comfort and softness. Stretchy & durable spandex added for extra stretch and shape retention; close-fitting style does better in retaining body heat to keep you warm.
BrandDEVOPS #ad

10. DEVOPS

#ad

DEVOPS 2 Pack Men's Thermal Long Sleeve Compression Shirts, Black / White, Medium

#ad
DEVOPS #ad - Ultra soft & warm thermal tech fleece fabric of the baselayer caresses the skin so naturally providing maximum comfort and softness. 90% polyester, 10% Spandex. Easy care Machine Washable. Stretchy & durable spandex added for extra stretch and shape retention; close-fitting style does better in retaining body heat to keep you warm. Versatile performance thermal Tops with ultra soft hand feel and heat-retention is a perfect option during various indoor activities, outdoor excursion and recreational activities.
BrandDEVOPS #ad