Men's long sleeve base layer · 170 GSM
Men's Merino Wool Henley Long Sleeve 170 Heathered Grey
5.01 reviews250 GSM is our everyday cold-weather standard — warm enough for winter city days, breathable enough for the trail.
Fabric weight guide
Which merino weight is right for you?
GSM is grams per square metre — how much fabric there is, not a warmth rating. Every weight is the same soft 17.5-micron Australian merino: it wicks sweat before it turns cold, insulates when it is cold and ventilates when it is warm. Lighter fabric breathes and dries faster; heavier fabric holds more heat when you stop moving. Choose by season and by how hard you will be working.
Warm & hot · 60°F+ / 15°C+
Best for: summer hiking, running, cycling, hot-climate travel, everyday tees and office wear; the next-to-skin layer under a 250 when you work hard in winter
Pick this if: you want a shirt that stays fresh for days, dries in an hour and keeps you cooler than cotton in the heat — or you simply run hot
Think twice if: you will mostly be standing still in the cold; on its own a lightweight layer has little insulation to offer
Shop 165 GSM →Cool to mild · 40–65°F / 5–18°C
Best for: spring and autumn as a standalone top, summer evenings, cool-morning hikes and commutes; winter as a base under a mid-layer
Pick this if: you want one merino layer that covers most of the year, or you are unsure between light and mid — this is where most people should start
Think twice if: you run cold and your winter is genuinely cold: go straight to 250
Shop 190 GSM →Cold · 20–45°F / −7 to 7°C
Best for: skiing and snowboarding, winter hiking, cold-weather work, frosty autumn mornings; top-and-bottom sets so your legs are not the weak link
Pick this if: you run cold in fall, want the classic winter base layer, or spend active days below freezing under a shell
Think twice if: you overheat easily on hard uphill efforts — a 165 or 190 underneath, 250 over it, is the better system
Shop 250 GSM →Deep cold · below 20°F / −7°C
Best for: ice fishing, hunting stands, camp at altitude, winter mornings spent waiting rather than walking, a house that never quite gets warm
Pick this if: warmth matters more than breathability, you are chronically cold, or your winter involves long spells standing still outdoors
Think twice if: you will be working hard — it is too warm for a sweaty climb, which is exactly the point
Shop 320 GSM →A base layer works by sitting close to the skin, where it can move moisture — loose is not more comfortable, just slower. Between sizes? Size down for a next-to-skin layer under a shell, size up to wear it on its own or over another layer. Merino stretches with wear and springs back after a wash. Heavier weight is not itchier: itch comes from coarse fibre, and every weight here is the same superfine merino.
Size guide
Size Guide
Our merino has a close, next-to-skin fit by design. If you are between sizes, stay true to size for base-layer use or size up for a more relaxed everyday fit. Free returns within 30 days, so ordering two sizes and sending one back is completely fine.
How to measure
Chest — around the fullest part of your chest, with the tape level under the arms.
Waist — around your natural waistline, with the tape comfortably loose.
Hips — around the fullest part of your hips and seat.
Inside leg — from the top of your inner thigh to your ankle bone.
Measure over light clothing, keeping the tape snug but not tight. Tap any chart below to open it full size.
Men's Base Layer Set
Need different sizes for the top and the bottoms? Build your own set →
Women's Base Layer Set
Need different sizes for the top and the bottoms? Build your own set →
Kids' Base Layer Set
Men's T-Shirt
Women's T-Shirt
Men's Long Sleeve
Same body measurements across 165, 190, 250 and 320gsm.
Women's Long Sleeve
Kids' Long Sleeve
Men's Long Johns
Women's Thermal Leggings
Kids' Thermal Leggings
Men's Half Zip
Women's Half Zip
Merino Wool Socks
Beanies, snoods and balaclavas
Still unsure which size to pick? Email info@merinotech.co.uk with your height, chest and waist and we will recommend a size. Free UK delivery over £49 and free returns within 30 days.
- Free UK delivery over £49
- 30-day free returns
- Ships in 1–2 business days
Description
Stay warm during even the coldest winter with the Merino.tech men’s long sleeve base layer t-shirt. Ideal for multi-day wear with no stink and comfort in all climates.
Benefits of Merino Long Sleeve Shirts
Perfect Base Layer
This Merino wool long sleeve shirt for men is great to be worn as a base-layer or mid-layer, and provides a perfect fit without bulk. Soft Merino wool easily adapts to anyone's figure, which makes this item snug-fitting but not constraining for your maximum comfort.
Odour Free
Merino wool clothes are ideal for several-day hikes and intensive workout sessions. This natural fabric easily absorbs moisture and forces it to dry faster. The protein elements that Merino fibre contains, eliminate odour and unpleasant smell.
Ideal for Daily Wear
Merino wool long sleeve shirts are multifunctional and suitable for a variety of situations. Put them on for ultimate relaxation at home, every day to the office, as well as special occasions and nights out. Try them out skiing, in the gym, or on a hike. You'll appreciate every moment you wear this Merino wool top!
Super Comfy
Our Merino wool clothes are incredibly comfortable. Flat seams of our items and ultra soft Merino wool prevent rubbing, overheating and bunching. We produce clothes with your comfort in mind, in hope they will become your fave essentials that you will reach for again and again.
Benefits of Merino Wool
Four Season Comfort
Clothes made of lightweight Merino wool will keep you warm and comfy during cold weather, and dry and refreshed during hot temperatures. This 165 GSM Lightweight fabric has great insulation qualities and is equally suited for cool and hot conditions.
Natural Material
100% Superfine 17.5 micron Merino wool men's base layer is breathable, soft and amazingly stretchy. Natural fibre of Merino wool clothes provides all day comfort and no itch.
UPF 50+ Protection
Ultraviolet protection is essential for everyone all year round. Merino wool lightweight men's base layer blocks out harmful rays of sun and keeps them away from the skin.
Moisture Wicking
Thanks to natural odour-resistant and perfect moisture-wicking properties of Merino wool, this Merino base layer for men will keep you dry and fresh even during long-lasting wear.
Material
100% merino wool
100% merino wool
100% merino wool
100% merino wool
100% merino wool
100% merino wool
Size option
S-XXL
S-XXL
One Size
4-8/9-12
S-XXL
XS-XL
Color options
6 Colors
20+ Colors
12 Colors
30+ Colors
9 Colors
8 Colors
Hiking Socks included
✓
✓
✗
✗
✗
✓
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.
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.
Size guide
Men's Long Sleeve 170 Henley
Fit
A close, next-to-skin fit that is true to size for a base layer. Between sizes? Stay true to size to wear it under other layers, or size up for a more relaxed fit on its own.
How to measure
- Chest – around the fullest part of your chest, tape level under the arms.
- Waist – around your natural waistline, tape comfortably loose.
- Hips – around the fullest part of your hips and seat.
- Inside leg – from the top of your inner thigh to your ankle bone.
Measure over light clothing and keep the tape snug but not tight. Still unsure? Email info@merinotech.co.uk with your height, chest and waist and we will recommend a size. Unworn items can be returned free within 30 days.
THE FABRIC
Why merino wool
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.
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.
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.
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.
Merino wool is naturally hard to ignite and self-extinguishes without melting onto the skin, unlike synthetic base layers.
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 170gsm henley base layer top best for?
It is a lightweight 170gsm merino layer, best for running, cycling, travel and layering. Compare every weight in our merino weight guide.
Is this henley 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.
XL Measurements:
33" : sleeve length (measured like a dress shirt).
30" : back of collar to hem.
44" : chest.
This is the only long-sleeve, Merino Wool, base-layer shirt I have found that is not tailored for knuckle-dragging orangutans. I bought two more.
The one negative is ...NO POCKET! That should be illegal. (It's a man's shirt - not a "top." Men (at least most of us) don't carry purses. We need pockets. Now, it can be argued that sticking stuff in pockets stretches the fabric. There is the option, however, not to use the pocket. But, with no pocket there is no option.)
Oh, and the collar. It fits close to the neck as opposed to the ridiculously common blouse-like fit.
I like it. At 100% wool, I just hope it remains hole-free.
