Top 10 Merino Base Layer UK – Men’s Thermal Tops

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1. MERIWOOL

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MERIWOOL Mens Base Layer 100% Merino Wool Heavyweight 400g Thermal Shirt for Men Black

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MERIWOOL #ad - Package includes: 1 – men’s merino wool thermal crewneck top in black / Large | MATERIAL: 18. 5 micron, 100% merino wool, 400g/m2 | FIT: Fitted. Exceptional customer care: if your meriwool men’s heavyweight baselayer crew doesn’t perform to your satisfaction, return it to us within 30 DAYS along with proof of purchase for a hassle-free refund, exchange, or replacement.

Wicking & odor resistance: merino wool’s natural wicking and odor-resistant properties keep you dry and comfortable while active in cold weather. 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, playing sports, skiing, hiking, hunting, or partaking in any outdoors activity. 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. 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. Includes a 90 dAY limited manufacturer’s warranty. Through the process of wicking, Merino wool is the most breathable fabric and absorbs moisture better than any other fibers.
BrandMERIWOOL #ad
ManufacturerMERIWOOL #ad
Height10.16 cm (4 Inches)
Length24.13 cm (9.5 Inches)
Weight1.06
Width12.07 cm (4.75 Inches)

2. Smartwool

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Men's, Deep Navy, XL, Merino 250 Baselayer 1/4-Zip

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Smartwool #ad - Insulation weight: midweight 250g/m2. Style: 1/4-zip. Material: 100% merino wool. Fit: slim. Center back Length: medium 29in.
BrandSmartwool #ad
ManufacturerSmartwool #ad
Height8
Length10
Weight0.75
Width3
Part NumberSW016355092XL
ModelSmartwool

3. FALKE

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M, Blue Capitain 6751, FALKE Men's Wool-Tech Light Round Neck M L/S SH Functional Yarn Quick Dry 1 Piece Base Layer Top

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FALKE #ad - Versatile thermal long sleeve sports top for men and teenage boys, to wear by itself or as a baselayer, in a soft breathable and thermo-regulating merino wool blend offering an ideal protection in warm or cold temperatures; for summer or winter. Sport thermals underwear with long sleeves in a regular comfort fit; great combined with FALKE sport shorts, leggings, 3/4 or long sport tights; great shape and colour retention; this round neck underlayer top can be washed at 30°C on a gentle cycle.

Men's sports baselayer top: 33233; available in sizes: S, M, XL, L, XXL. Falke, a family business founded in 1895, stands on a firm foundation of values: unconditional quality, the highest craftsmanship and environmentally friendly packaging without plastic hooks; we accompany you with innovative and functional products.

Model number for the falke wool tech. Stretchy sports t-shirt with temperature regulation keeping you warm in cold weather or cool in hot weather; keeps the body dry during sport thanks to the double layer structure; odour-neutralising effect; for trekking, walking, hiking, equestrian sports. Special knitting techniques ensure a perfect fit; the seamless finish guarantees the highest comfort, unrestricted freedom of movement and prevents pressure points, enabling you to achieve the an optimum performance.
BrandFALKE #ad
ManufacturerFALKE KGaA #ad
Part Number33233
Model33233

4. Smartwool

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Smartwool Merino 250 Base Layer Crew, Ultra Violet, XL

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Smartwool #ad - Center back Length: small 24in. Fit: slim. Style: crew. Material: 100% merino wool. Insulation Weight: 250gsm.
BrandSmartwool #ad
ManufacturerSmartwool #ad
Height2
Length10
Width9
Part NumberSW016369-L46-XL
ModelSmartwool

5. MERIWOOL

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

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MERIWOOL #ad - 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. Breathable: keeping you cool in summer and warm in winter, playing sports, 250g/m2 weight interlock-knit Merino wool can be used as a base layer or mid-layer, working, snowboarding, but won’t weigh you down.

Package includes: 1 – merino wool men’s merino wool thermal crewneck top in charcoal Gray / X-Large | MATERIAL: 18. 5 micron, 100% merino wool, 250g/m2 | FIT: Fitted. Comfortable & convenient: quick-drying shirt features a loop for hang drying while camping, hunting, hiking, skiing, or partaking in any outdoors activity. Wicking & odor resistance: merino wool’s natural wicking and odor-resistant properties keep you dry and comfortable while active in cold weather.

Wicking refers to a fabric’s ability to pull moisture away from your body and keep you comfortable. Includes a 90 dAY limited manufacturer’s warranty. 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. Through the process of wicking, Merino wool is the most breathable fabric and absorbs moisture better than any other fibers.
BrandMERIWOOL #ad
ManufacturerMERIWOOL #ad
Height3.19
Length9.8
Weight0.75
Width5
Part NumberLYSB06XC82BSK-SPRTSEQIP
ModelCrewneck

6. HEAT HOLDERS

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HEAT HOLDERS, Mens Winter Warm Cotton Thermal Underwear Short Sleeve T Shirt Vest Large 41-43" Chest, Charcoal

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HEAT HOLDERS #ad - Thermal lining - this top has thermal lining to ensure you stay warmer for longer as it retains heat close to the skin. 2 colours - choose from Charcoal or White to wear underneath your clothes. Longer body length - this thermal top has a longer body length so you can tuck it easily under your clothes. Ribbed construction - the ribbed construction of this thermal underwear has been designed so that it effortlessly shapes to the bodies natural contours. Cotton rich - this cotton rich blend top feel super soft and comfortable no matter the layer.
BrandHEAT HOLDERS #ad
Part NumberHHMTUSSLCHA-mpn
ModelHHMTUSSLCHA-mpn

7. Icebreaker

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Black/Monsoon, Large, Icebreaker Anatomica LS Crewe Underwear

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Icebreaker #ad - Flatlock seams prevent chafing. Centre back length: 73. 3cm size M. Slim fit. Lycra content for stretch and mobility. Core spun fabric for enhanced durability.
BrandIcebreaker #ad
ManufacturerIcebreaker #ad
Height3.94
Length11.81
Weight0.55
Width8.46
Part Number103032001L
Model103032_L

8. Smartwool

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Smartwool Merino 150 Base Layer Long Sleeve Indigo Blue MD

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Smartwool #ad - Offset shoulder and side seams designed to increase comfort and minimize chafing while wearing a backpack. Flatlock seam construction designed to minimize chafing. 87% merino wool, 13% Nylon. Our lightest weight merino jersey fabric uses a nylon core to increase durability while still keeping 100% Merino wool next to skin. Side seams wrap to front for body-enhancing fit. Sw000748.
BrandSmartwool #ad
ManufacturerSMARTWOOL #ad
Height8
Length10
Weight0.45
Width3
Part NumberSW000748
ModelSW000748

9. Smartwool

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Smartwool Men's Merino 250 Baselayer Crew Charcoal Heather Medium Mens

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Smartwool #ad - Go far. Go far, feel good with thoughtful tech to keep you trekking comfortably — interlock knitting enhances breathability, thermoregulation and moisture-wicking while flatlock seams minimize chafing for greater comfort. We've updated this fan-favorite with new colors and a new fit to improve functionality while enhancing aesthetics.

Ideal for cold-weather activities where warmth and breathability are crucial, this midweight fabric used a 100% Merino wool construction that helps move moisture away from skin to keep you warm and dry. Functional features. Designed to meet the demands of outdoor adventuring, this slim fit crewneck shows off a slimming silhouette while offering unrestricted movement through the arms and chest.

Add this cold weather base layer to your winter wardrobe and experience the difference on your next adventure. Slim fit. Feel good. From wool socks to base layers for men, women and kids, we aim to provide the highest quality apparel for your outdoor adventures with a commitment to environmental sustainability, racial equity and inclusivity. Classic thermal merino. Cold weather base layer.
BrandSmartwool #ad
ManufacturerSmartwool #ad
Height2
Length5
Weight0.6
Width4
Part NumberSW016349010-M
ModelSmartwool

10. FALKE

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Black Black 3000, M, FALKE Men's Wool-Tech High Zip Neck M L/S SH Thermal Breathable Quick Dry 1 Piece Base Layer Top

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FALKE #ad - Special knitting techniques ensure a perfect fit and proportions; the seamless finish ensures the highest wearing comfort, unrestricted freedom of movement and prevents unpleasant pressure points, enabling you to achieve the best athletic performance. Sport thermals underwear with long sleeves in a regular comfort fit; great combined with FALKE sport shorts, leggings, 3/4 or long sport tights; high zip neck underlayer top with excellent shape and colour retention even after repeated washing; machine wash 30°C gentle.

Model number for the falke men's wool tech. Thermal long sleeve sports top for men and teenage boys, to wear by itself or as a baselayer, in a soft merino wool blend offering an ideal protection in cold to very cold outdoor temperatures; ideal in winter; with designer logo on chest. Environment-friendly packaging without plastic hooks and unique falke quality since 1895 with a solid foundation of values: unconditional manufacturing and product quality as well as in all facets of the family business, a willingness to experiment, the highest level of craftsmanship by our creative teams with inner variety and diversity as well as curiosity, learn and the will to do the inevitable constructively overcoming resistance to innovation; we accompany you at every age with new ideas and modern products.

Regular fit zipped longsleeved base layer top: 33410; available in sizes: S, XL, L, M, XXL. Stretchy zipped sports t-shirt for man; keeps the body warm and dry during sport thanks to the double layer structure; odour-neutralising effect; for trekking, equestrian sports, snowboarding, hiking, skiing, walking, cross country skiing.
BrandFALKE #ad
ManufacturerFALKE KGaA #ad
Weight0.42
Part Number33410
Model33410