100% Merino Wool - Heavyweight · 320, GSM
Camiseta de manga larga con media cremallera para hombre, de lana merino 320, gris jaspeado
4.85149 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 weather · 60°F+ / 15°C+ — and high effort in any season
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
Cool to mild · 40–65°F / 5–18°C
Best for: spring and fall 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
Cold · 20–45°F / −7–7°C — the classic winter base layer
Best for: skiing and snowboarding, winter hiking, cold-weather work, frosty fall 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
Deep cold · below 25°F / −4°C — especially when you stop moving
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
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.
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Features & Details:
Details:
Knit: 320 g/m2 Heavyweight
Seasons: Fall, Winter
Layer Type: Base Layer, Mid Layer
Temperature Recommendations: 0°F and below while active, 0°F to 30°F while inactive
Fit Type:
Regular - A standard fit that strikes the perfect balance between comfort and a tailored look, allowing for easy movement without feeling too loose.
Recommended Activities:
Everyday Wear, Hiking, Camping, Biking, Running, Fishing, Hunting, Snowsports
Description
Esta camiseta de manga larga es perfecta para una amplia gama de actividades y ofrece una mezcla de moda y funcionalidad.
Confeccionada con 100 % lana merino, proporciona una calidez excepcional, evacua la humedad y regula la temperatura de forma natural.
Las propiedades antimicrobianas naturales de la lana merino garantizan la resistencia a los olores, y su suave tacto contra la piel garantiza un ajuste cómodo.
Ya sea que estés practicando senderismo, esquí o disfrutando de un día informal, nuestra camiseta de manga larga con media cremallera de lana merino gris jaspeado es una adición versátil a tu guardarropa, que ofrece tanto estilo como rendimiento.
Materials & Care
Washing and Drying Instructions
- Turn Inside Out
- Machine Wash Cold: Gentle cycle with like colors
- Detergent: Mild or wool-specific
- Lay flat to dry
- Storage: Wash before storage and keep in a dry place, using airtight containers or vacuum-sealed bag to prevent moth.
- Do NOT Use: Fabric softener or bleach!
Guarantee
- 30 Day Satisfaction Guarantee
- 1 Year Warranty
Never Smells
Dry Fast
Wick Moisture
Natural Airflow
THE FABRIC
WHY MERINO WOOL
01INSULATES WHEN WET
Wool has the remarkable ability to absorb up to 30% of its weight in moisture without ever feeling wet or sticky. In the event that it does become wet, wool outperforms cotton and polyester materials by providing superior insulation.
02ANTI-MICROBIAL
Merino Wool fibers possess a natural ability to repel bacteria in moisture or sweat, effectively wicking it away. This means you can wear our products without worrying about foot fungus or unpleasant odors.
03FIRE RESISTANT
Merino Wool offers excellent insulation against high temperatures and has a natural resistance to catching fire. In the rare event of ignition, it self-extinguishes without melting and adhering to the skin, unlike synthetic fabrics.
THE FABRIC
01MOISTURE WICKING
Merino Wool regulates moisture levels on your skin by absorbing any perspiration or sweat from your body, allowing it to evaporate from the fabric into the surrounding atmosphere.
02UV PROTECTION
Leave your sunburn worries behind as you ascend to sunlit peaks. Our lightweight layers provide a UPF rating of 25, while the midweight and expedition options offer an even higher UPF rating of 50+
03RENEWABLE
Merino Wool boasts a minimal environmental footprint and seamlessly reintegrates into the natural world. Shear a merino sheep in the morning, and by afternoon, they're happily grazing their way towards renewing next season's wool clip
I always avoided wool clothing because it was too picky and uncomfortable. New merino wool garments from MerinoTech are comfortable, warm, antimicrobial, and most importantly when backpacking for days without a shower ... stink-resistant! I love my 100, 200, and 300 level gear depending on the days and my wool hat is great while hiking and while sleeping in sub-freezing temps in my tent.
Item runs small
Item runs small
Love this half zip, nice and warm
Love this half zip, nice and warm
My first purchase of marino wool. Very nice. The washing procedure may be its down fall. Consider supplying a wash bag with your products. Socks are great, bur I cant stuff my pullover in them to wash.Just a thought! Think about it. Probably wouldnt want to go heavier than 320 for the hunting I do.
My first purchase of marino wool. Very nice. The washing procedure may be its down fall. Consider supplying a wash bag with your products. Socks are great, bur I cant stuff my pullover in them to wash.Just a thought! Think about it. Probably wouldnt want to go heavier than 320 for the hunting I do.
Men's Merino Half Zip Long Sleeve 320 Heather Gray
Men's Merino Half Zip Long Sleeve 320 Heather Gray
Men's Merino Half Zip Long Sleeve 320 Heather Gray
Men's Merino Half Zip Long Sleeve 320 Heather Gray
Great fabric, looks great!
Great fabric, looks great!
This shirt is great, fits very well, good quality, warm (320 version) but not too hot. I'll likely order another in different colours.
This shirt is great, fits very well, good quality, warm (320 version) but not too hot. I'll likely order another in different colours.
Used this mid layer (250) in the Sierra Nevadas this week in 30 degree temperatures and it worked flawlessly. I had a shirt, the mid layer and a hoodie on and hiked all day in them and was warm. The mid layer is very soft and thin, which is preferred to keep the bulkyness down. I would definitely recommend and I’m going to buy the thicker one as well.
Used this mid layer (250) in the Sierra Nevadas this week in 30 degree temperatures and it worked flawlessly. I had a shirt, the mid layer and a hoodie on and hiked all day in them and was warm. The mid layer is very soft and thin, which is preferred to keep the bulkyness down. I would definitely recommend and I’m going to buy the thicker one as well.
Great for layering
Great for layering
My husband looks amazing in this, he's 6'4 200, had to order a size larger than the size chart but it looks fantastic on him!
My husband looks amazing in this, he's 6'4 200, had to order a size larger than the size chart but it looks fantastic on him!
The shirt was absolutely fantastic! Warm soft, not itchy (much) and the zipper allows you to cool down if you’re very active and getting too warm. The free socks is a great incentive but they were obviously machine washed. But for free…I also purchased the bottoms that match the shirt, they’re fantastic too! The socks included in that package were in fact new and unused. Overall? I’m buying another shirt because it’s that good for cold weather.
The shirt was absolutely fantastic! Warm soft, not itchy (much) and the zipper allows you to cool down if you’re very active and getting too warm. The free socks is a great incentive but they were obviously machine washed. But for free…I also purchased the bottoms that match the shirt, they’re fantastic too! The socks included in that package were in fact new and unused. Overall? I’m buying another shirt because it’s that good for cold weather.
It is very warm love it
It is very warm love it
This merino wool sweater looks great and fits perfectly. I’m not sure how they measure the weight of the wool but I love the way it looks.
This merino wool sweater looks great and fits perfectly. I’m not sure how they measure the weight of the wool but I love the way it looks.
Fit is slightly snug and long in the torso, which isn’t ideal to wear casually but PERFECT for actual activewear/layering in cold weather. Kept me perfectly temperate during a hard hilly 10k run today at 33F, layered over Patagonia Capilene. Buy from this brand and enjoy 99% of SmartWool’s quality for 30% of the price - and I say that as a fan of SmartWool.
Fit is slightly snug and long in the torso, which isn’t ideal to wear casually but PERFECT for actual activewear/layering in cold weather. Kept me perfectly temperate during a hard hilly 10k run today at 33F, layered over Patagonia Capilene. Buy from this brand and enjoy 99% of SmartWool’s quality for 30% of the price - and I say that as a fan of SmartWool.
Stylish and comfortable. I bought a size up (bought xxl while I typically wear xl) which was perfect. Can wear it to work and leisure like hiking. Very versatile and practical. Love it.
Great wool shirt. Soft and comfortable and warm. Size is what it says and fits well
Questions people ask about merino
What is merino wool, and what makes it different from regular wool?
Merino wool comes from Merino sheep and is measured in microns — the thickness of a single fibre. Merino.tech uses 17.5 micron Australian merino, which is roughly a third the thickness of the coarse wool most people remember from old jumpers. Finer fibres bend against the skin instead of pressing into it, which is why merino feels soft rather than scratchy while still insulating, breathing and resisting odour naturally.
Is merino wool itchy?
No. Itch is caused by fibre diameter, not by wool itself. Fibres above roughly 22 microns are stiff enough to trigger the prickle response; ours measure 17.5 microns, well under that threshold. Every piece here is 100% Australian merino with no synthetic blend in the body fabric, so there is nothing rough sitting against your skin.
How do I wash merino wool without ruining it?
Turn the garment inside out, machine wash cold on a gentle cycle with like colours, and use a mild or wool-specific detergent. Lay it flat to dry. Never use fabric softener or bleach — softener coats the fibre and destroys the breathability you paid for. Merino resists odour, so you can wear it several times between washes, which is the easiest way to make it last.
Is merino wool warm enough for real winter?
Warmth is set by fabric weight, measured in grams per square metre. 165 and 180 are lightweight layers for runs and mild days. 200 is the everyday weight. 250 covers autumn through proper cold and is the most popular choice for skiing and hiking. 320 is heavyweight, made for standing still in real winter — ice fishing, chairlifts, cold work outdoors.
Does merino wool shrink?
It can, but only under heat and agitation. Hot water and a tumble dryer cause the scales on the fibre to lock together permanently. Cold water, a gentle cycle and flat drying prevent it entirely. Follow that and the garment keeps its shape for years.