Men's base layer pants · 165 GSM

Men's Merino Pants 165 Charcoal Grey

4.67100 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 fit through the leg.

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

Men's Merino Pants

From city streets to mountain trails, the Charcoal Grey Men’s Merino Wool Pants perform beautifully in every environment. Crafted from temperature-regulating Merino fibres, they provide optimal comfort through all seasons.

Breathable and moisture-wicking, they keep sweat off your skin, while odor control keeps you fresh no matter how long the day gets. Lightweight yet durable, they’re built for mobility and confidence.

With UV protection, antistatic benefits, and sustainable construction, they embody the perfect blend of rugged functionality and timeless style.

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
The bottom half of staying warm

Men's base layer pants

The bottom half of staying warm

A soft merino legging with a wide comfort waistband and flatlock seams. Wear under ski pants, jeans or hiking trousers — or on their own at the cabin.

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 long johns: FAQ

What is this 165gsm thermal long johns 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, XXXL. Our merino is true to size and designed to sit close to the skin; see the size guide for measurements.

Is this thermal long johns 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.

What are merino base layer bottoms used for?

Merino long johns are thermal leggings worn under trousers, salopettes or waterproofs. They trap warmth, move sweat away from your legs and stop the cold, clammy feeling that cotton leaves behind, whether you are skiing, hillwalking, fishing or working outdoors.

Which weight of merino long johns do I need?

165gsm for mild days and high-output sports, 200gsm for cool UK weather and layering under jeans, 250gsm midweight for most winter activities including skiing, and 320gsm heavyweight for severe cold or standing still for long periods.

Can I wear merino thermal leggings under jeans or work trousers?

Yes. The fabric is thin for the warmth it gives and the flatlock seams lie flat, so they sit comfortably under jeans, chinos and work trousers without bulk.

How should merino long johns fit?

Snug from waist to ankle so they wick properly and do not bunch under other layers. They are true to size; check your waist and inside leg against the size guide.

Should I buy a matching top?

A top and bottoms in the same weight give the warmest, most even layering. Buying them as a base layer set costs less than two separate pieces, or you can mix weights in the set builder.

Reviews · verified by Judge.me

Worn & loved

4.6
Based on 7100 verified reviews
Write a review
  • 5 stars: 4292 (60%)
  • 4 stars: 2801 (39%)
  • 3 stars: 0 (0%)
  • 2 stars: 2 (0%)
  • 1 star: 5 (0%)
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.