OG Long Sleeve
The original since 2016
- Weight
- 200gsm
- Micron
- 18.5
- Knit
- Single Jersey
- Thumbloops
- Original
- Best for
- Layering, travel, daily
- Built for
- Going Under
The transformation
The one that started it all.
Since 2016, the Men's OG Long Sleeve has been the first merino piece thousands of travellers, runners and hikers own. Here's why it's still the one we keep making, and the one most people keep coming back to.
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Before
A drawer full of synthetics and old cotton.
Tops that run hot one minute, cold the next. Layers that trap sweat. Pieces that fall apart after a season of real use.
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The shift
One 200gsm merino long sleeve. Made properly.
100% merino, 18.5 micron, with the classic relaxed fit and Original thumbloops we've been making since 2016. The piece you'll actually want to live in.
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After
The first thing you reach for. Year after year.
Travel layer. Run layer. Base layer for the snow. Daily layer at home. The shirt that goes everywhere you do, and still looks the part nine years in.
Designed in New Zealand. The original since 2016.
Compare the lineup
Three weights. One wool standard.
Same 18.5 micron merino across the range. The difference is how heavy you want it, and how you plan to wear it.
How they differ
At a glance.
Weight
200gsm
200gsm
300gsm
Micron
18.5
18.5
18.5
Knit
Single Jersey
Refined Jersey
Terry Loop
Thumbloops
Original
Ninja
None
Best for
Layering, travel, daily
Everyday wear
Cold mornings, standalone warmth
Built for
Going Under
Going Everywhere
Going Colder
Standard Long Sleeve
The OG, refined thumbs
- Weight
- 200gsm
- Micron
- 18.5
- Knit
- Refined Jersey
- Thumbloops
- Ninja
- Best for
- Everyday wear
- Built for
- Going Everywhere
Crew Sweatshirt
Built for the cold
- Weight
- 300gsm
- Micron
- 18.5
- Knit
- Terry Loop
- Thumbloops
- None
- Best for
- Cold mornings, standalone warmth
- Built for
- Going Colder
Built for the way you live
Three reasons it earns the price.
Not warmth, not softness, not durability. All three. Made the way good clothing used to be made.
01 / Original
The original thumbloops. Not the only ones we make.
Look at almost any M365 photo since 2016 and you'll see them: a D-shaped loop extending up from the cuff, framed by a 1.5cm self-fabric edge for shape and support. Pull it over your hands on a cold morning. Push it back when you don't need it. If you'd rather have something hidden and sleek, that's the Standard's Ninja design. But the Original is the one that built this brand.
Distinctive D-shaped Original thumbloops on the OG. Hidden Ninja thumbholes on the Standard. Same wool, two ways to wear it.
02 / Heritage
Same shirt. Since 2016.
When we got the OG right the first time, we stopped trying to fix it. Same wool standard, same weight, same classic relaxed fit nine years on, because thousands of customers told us not to change a thing. The piece you can buy now, replace in five years, and have it feel exactly the same.
Worn by travellers, runners, hikers and skiers since 2016. 69+ reviews per colour.
03 / Real wool
Soft. Not scratchy.
Soft against the skin from the first wear. The kind of softness that makes you forget you're wearing wool at all. No itch, no scratch. Just something honest, made from something real.
18.5 micron merino. The same wool standard across our range, since 2016.
Specs at a glance
What's in the build.
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200gsm single jersey knit
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18.5 micron, soft next to skin
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Classic relaxed crew neck
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Self-fabric cuffs with D-shaped Original thumbloops
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Base layer, travel layer, daily layer
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Machine wash, wool cycle
From one of ours
From Auckland to the Arctic Circle.
Bought two for our family trip to Lapland — 275km north of the Arctic Circle. We had extreme weather gear for the conditions, but it all starts with the right base layer. 10/10.
Packed by hand at home.
What's included
More than a shirt.
Here's what arrives, who's behind it, and how we stand behind every piece.
The Men's OG Long Sleeve.
200gsm of merino. Since 2016.
The original. 100% merino at 18.5 micron, classic relaxed fit, and D-shaped Original thumbloops on a 1.5cm self-fabric cuff. The piece thousands of travellers, runners and hikers have made their daily layer for nearly a decade.
A New Zealand family business.
Independently run.
When you buy from us, you're supporting a family team in NZ, not a global corporation. We answer the emails. We pack the orders. We've been doing this since 2016.
Flat Rate NZ shipping. Confidence to commit.
Always a nice offer in the cart as well.
Faulty? Full refund. Change of mind? 30-day exchange or store credit. We stand behind every piece.
Questions, answered
Before you buy.
The honest answers to what most people ask us. If yours isn't here, get in touch.
How does it fit?
A classic relaxed cut, generous through the body and shoulders, with sleeves long enough to extend to the base of the thumb. Available in Medium Tall and Large Tall if you need extra body length. Our model is 6'0" and wears a Large. Comfortable solo, easy to layer under a jacket or over a base layer.
Where is it made?
We use 18.5 micron merino, the same wool standard across our range since 2016. The garment is made by a trusted manufacturing partner in China we've worked with for years.
How do I wash and care for it?
Machine wash cold on the gentle or wool cycle, using wool detergent. Lay flat or line dry. Don't bleach. Treat it like a piece you want to keep for years, not seasons.
Will it shrink, pill, or itch?
It won't shrink or itch when cared for properly. At 18.5 micron, the fibres are fine enough to sit soft against bare skin. No scratch. The single jersey knit holds its shape. Wash on the wool cycle and lay flat. Like all fine merino, a little light pilling can show where bags or seatbelts rub, and it brushes off easily.
How does this compare to your other long sleeves?
The OG is the original: the long sleeve we've been making since 2016, and the one thousands of people own first. Classic relaxed fit. D-shaped Original thumbloops extend up the arm from a 1.5cm self-fabric cuff. The Standard is the refined version, with the same 200gsm of 18.5 micron merino and exactly the same cut and fit; the only difference is its 5cm self-fabric cuff with hidden Ninja thumbholes. The Crew Sweatshirt is the heaviest piece at 300gsm, an outer layer for cold mornings. The OG is the one you'll layer with everything. (See the comparison above.)
What if it doesn't fit when it arrives?
You've got 30 days to exchange it for the right size or take store credit. You cover return shipping; we cover the new piece coming out to you. Faulty or not as described? Full refund, always.
One last thing
The original. Still.
Same shirt since 2016. Same wool, same weight, same classic fit. Restocked and refined where it matters, untouched where it counts. The piece thousands of customers have made their first M365 buy, and many more keep coming back for.
Choose your size
Packed by hand at home. 30-day exchange or store credit.
Flat rate NZ shipping
30-day exchange or credit
Secure checkout
NZ family business since 2016
Some of the reviews shown are from related products the merchant grouped with this one.
G
Bought two of the OG long sleeve for our family trip to Europe.
We are currently in Muonio, Lapland, 275km north of the Arctic circle ❄️❄️ and they have kept me toasty and warm!
We are supplied with extreme weather gear for the conditions, but it all starts with the right base layer - these are great.
10/10 recommended.☃️
Wow, what an awesome adventure!!
S
Lucy & Fran do a great job with their boutique! Always completely satisfied*
Thanks Stephen, Nice to hear that from you over there in the USA!
P
The long-sleeved Merino base-layer (Iron Marle) is a great product for its ability to provide instant warmth & coziness when the weather is cool.It’s softness & roominess makes it ideal to wear alone or as a base layer under a sweater or coat when things get cold. I particularly appreciate its versatility in being able to be worn for sleep, lounging, or outdoor activities.It’s extremely comfortable & easy to wash.
D
Beautifully stretchy cuffs; right fit to the shoulder "yoke correct" design; and sleeves handle being rouged up my arms.
During long marching on the flat; my arms get hot. I call it kangaroo heat.
I get my forearms (and shins) cool: and I'm good!
And: the colour is beautiful; shifts and changes in the light. I always feel ready for the next part of the march.
Just because you're two huts deep into the reserve: doesn't mean you can't look a proper gentleman.
D
I live in merino; and these Merino 365 OG Long sleeve are exceptional.
When I go down into town: I make food and coffee; and go back into the high lands. Cold but dry up there. Home. You need to dress for it.
D
Very carefully considered design: and exceptional manufacturing.
Properly brave colors: appropriate for any gentleman.
The balance of wild and rural life needs must demand the same colors of any wild being!
A
Great colour, soft warm fabric and fits well.
A
Just what I wanted
A
Very comfortable material, not too heavy, not too warm. Great all rounder.
A
Nice product, but still has a slight itchy factor. Bought OG Mens to fit my ample middle and hips as I don't like really clingy tops, but too long in the shoulders and sleeves, so lucky husband now has new merino. :)
V
My husband and love your products.
A
Great colour, really warm and comfortable. Bought the men's size small coz they don't make this color for women. Very good fit, nice long sleeves.
M
Great quality and fit. I'm a big bodied man and fit is an issue. So happy with this item.
C
I’m a very satisfied customer. The online product information gave me the confidence that the fit would work out well.
My primary concern was the sleeves—I’m 6’ 4” tall and 36” sleeve is ideal.
When my shipment arrived and tried it on—YES IT FIT PERFECTLY!!
And I love the Desert colour.
Looking forward to buying more down the line.
M
The sizing was very big especially the sleves. It was more lie an OS rather than a L
Appreciate the feedback, Mike - though a heads-up would’ve been helpful.
We’re pretty quick to sort sizing issues, but we can’t fix what we don’t know about. Always happy to exchange if something’s not right… just need the chance
K
Another quality item from 365! It’s a new colour for me - I’m usually buying greens and blues. I love the look of it. I wear it as a light sweater over the top of a merino t-shirt so I went up a size. It is comfortable and warm and I expect to wear it for years to come.
P
Great weighted long skeeve warm 👍🏿
C
⭐⭐⭐⭐⭐
Excellent merino set. Warm, comfortable, and breathable without feeling bulky. Perfect for cold weather, travel, or layering. Great quality and highly recommended. 👍
C
Excellent quality and very comfortable. Soft, warm, and breathable, making it perfect for cooler days. The Orion Blue colour looks great too. Highly recommend. 👍
L
Top quality product and excellent service to match.
M
A quality product and a great colour. Very comfortable.
R
Really good product - comfortable long sleeved top
G
Good fit, light weight but without being flimsy, like the colour and very comfortable
P
I’ve been an advocate of merino products for years and has supported another NZ brand before finding M360. Love the products and have bought more. Even got a handwritten note thanking me . Great people
N
Very pleased with purchase and service..
Have found this to be very comfortable & warm especially biking.
Fast delivery & the hand written note of appreciation on the invoice was a nice gesture .
J
Hubby loves his new Merino and having the thumb option. He is of slim build and the large is perfect.
G
Great quality and very efficient service and delivery.
A
A little tight on the neck but otherwise great