Men's long sleeve base layer · 165 GSM

Men's Merino Long Sleeve 165 Arctic

4.66996 reviews
£49.99
Fabric weight

250 GSM is our everyday cold-weather standard — warm enough for winter city days, breathable enough for the trail.

Size: S

True to size · close, next-to-skin fit.

  • Free UK delivery over £49
  • 30-day free returns
  • Ships in 1–2 business days
Description

Its natural elasticity ensures a comfortable fit, making it suitable for both casual outings and outdoor adventures like hiking, camping, and everyday activities in chilly conditions.

Embrace the hypoallergenic and moisture-wicking properties of Merino wool, providing gentle care for your skin and ensuring a delightful wearing experience in various weather conditions.

Elevate your winter wardrobe with the luxury and versatility of Merino wool.

Care

Turn inside out. Machine wash cold on a gentle cycle with like colours and a wool-safe detergent. Do not bleach. Lay flat or hang to dry — do not tumble dry.

Shipping & returns

Free UK delivery on orders over £49. Orders ship within 1–2 business days. 30-day free returns on unworn items with tags attached.

MOISTURE WICKING
ODOR RESISTANT
TEMPERATURE REGULATING
100% MERINO WOOL
Built for layering, worn on its own

Men's long sleeve base layer

Built for layering, worn on its own

A close, next-to-skin fit with flatlock seams and a long body that stays tucked. Wear it alone on cool days or as the first layer under a shell when it really gets cold.

THE FABRIC

Why merino wool

01Moisture wicking

Merino wool moves sweat away from your skin as vapour and lets it evaporate from the fabric, so you stay dry and comfortable whether you are hiking, commuting or skiing.

02Odour resistant

Merino fibres naturally resist the bacteria that cause odour, so you can wear a base layer for several days, on the trail or while travelling, and it still smells fresh.

03Insulates when wet

Wool can absorb up to 30% of its weight in moisture without feeling wet. In damp British weather it keeps insulating where cotton and polyester leave you cold.

04UV protection

Merino absorbs UV radiation: our lightweight layers offer UPF 25 and the midweight and heavyweight options UPF 50+, handy on long days in the hills.

05Flame resistant

Merino wool is naturally hard to ignite and self-extinguishes without melting onto the skin, unlike synthetic base layers.

06Renewable

Merino is a natural, renewable and biodegradable fibre. Sheep grow a new fleece every year, and a worn-out merino garment breaks down instead of shedding plastic microfibres.

FAQ

Men's merino base layer tops: FAQ

What is this 165gsm base layer top best for?

It is a lightweight 165gsm merino layer, best for running, cycling, travel and layering. Compare every weight in our merino weight guide.

Which sizes are in stock?

Available to order now: , S, M, L, XL, XXL. Our merino is true to size and designed to sit close to the skin; see the size guide for measurements.

Is this base layer top warm enough for skiing?

It works for spring skiing, ski touring or as a thin layer under a warmer mid layer. For a standard winter ski week, most people choose 250gsm.

Which weight of merino base layer should I choose?

Pick by temperature and activity. 165gsm lightweight suits spring, summer and high-output sports; 190gsm is a year-round all-rounder; 250gsm midweight is the classic UK winter base layer for hillwalking, skiing and cold commutes; 320gsm heavyweight is for deep cold and standing still, such as fishing, stalking or winter camping. Compare them in our weight guide.

How should a merino base layer top fit?

Close to the skin without feeling tight, because a base layer can only move sweat away when it touches you. Our tops are true to size. If you are between sizes, size down for a next-to-skin layer under a jacket and size up to wear it on its own. Check the size guide.

Can I wear a merino long sleeve on its own?

Yes. The tops are cut clean enough to wear as a normal long sleeve T-shirt or turtleneck on cool days, then work as the first layer under a fleece or shell when it gets properly cold.

How many days can I wear a merino top before washing it?

Usually several days of normal wear. Merino resists the bacteria that cause odour, so airing it overnight is often enough on a trip. Wash it when it looks or feels grubby rather than after every wear.

Is merino warmer than a synthetic thermal top?

Merino feels warmer in real use because it keeps insulating when damp and regulates temperature, so you get less clammy on the way up and less chilled when you stop. Synthetic thermals dry faster but hold on to smells.

Reviews · verified by Judge.me

Worn & loved

4.6
Based on 6996 verified reviews
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Z
Zach O.
The perfect shirt

Absolutely love this shirt. The fit and feel is perfect and the colour is gorgeous.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with bottoms laid flat:Waist width: 14.5 inches unstretched. Stretches to 21 inches maximum. So circumference is from 29 inches to 42 inches maximum, but you obviously shouldn't stretch it that far.Length from waist to crotch seam: 11.5 inchesLength from waist to ankle: 39 inchesLength from crotch seam to ankle: 29 inchesAnkle width: 4.75 inches. Stretches to 8.5 inchesMy dimensions:Height: 5 feet 10 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesCircumference of thickest part of thigh: 21 inchesCircumference of calf: 14 inchesCircumference of ankle: 8.5 inchesInseam: 31 inchesI weigh 140 lbs.This bottom fits me slightly loose. It's not tight like running tights, but still clings close enough to allow this to fit comfortably under a pair of pants. The material itself can stretch about 50%. For instance, the ankle width is 9.5 inches circumference unstretched, and 17 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

s
samuel

They keep me warm easily. Will buy again.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.

F
Farmer1492

Here are actual measurements for a size Medium. I wish every garment company and reviewer would do this. I'll follow with my measurements and how it fits.Dimensions with top laid flat:Chest width: 20 inchesWidth at bottom: 19 inchesLength from center of neck at collar down shoulder to wrist: 36 inchesLength from armpit seam to wrist: 21.5 inchesLength from rear of collar to bottom: 29.5 inchesLength from from of collar to bottom: 24.25 inchesWidth at wrist opening: 4 inchesMy dimensions:Height: 5 feet 10 inchesNeck circumference: 13 inchesLength from center of neck at collar line down shoulder to wrist: 33 inchesLength from armpit to wrist: 18.5 inchesChest circumference: 38 inchesWaist circumference at naval: 31.5 inchesWaist circumference at hip bones: 32.5 inchesBicep circumference (not flexed): 11 inchesWrist circumference: 7 inchesI weigh 140 lbs.This top fits me slightly loose. It's not tight like a compression top, but still clings close enough to allow this to fit comfortably under another shirt. The material itself can stretch about 50%. For instance, the wrist width is 8 inches circumference unstretched, and 11.5 inches fully stretched.The garment is very soft and not itchy. I have eczema and this material is not irritating at all.I posted a photo of the washing instructions tag.