Naturally Sustainable
Machine Wash & Dry
Naturally Anti-Odor
Breathable & Wicking
When it’s cold out, are you the first to go out and the last to come in? Even if it’s windy? Even if it’s snowing? If you said yes, then this top is calling your name. This ¼ zip features thumb holes, a mock neck, and a zipper for venting. You’ll love the warmth and comfort it provides while you are battling the elements! Pair this with our Katmai Men's Heavyweight Wool Bottom and we guarantee you’ll stay toasty warm all day long.
Fabric
- Fiber Content: 100% Merino Wool
- Knit: 400 g/m2 Heavyweight Interlock Knit
- Microns: 18.5 Micron Fibers
- UPF Rating: 50+
- Total Easy Care: Machine Wash & Dry
- Wool Source: Australia
- Imported.
Features
- Neckline: 1/4 Zip Mock Neck
- Thumbholes: Allow for easy layering and added hand warmth
-
Tagless Label: No Itchy Neck Tags
- Zipper: YKK Semi-Auto Locking Zipper Pull
- Zipper Garage: Keeps fabric between the zipper and your skin
- Flat Lock Seams: Prevents Chafing
- Layer Type: Mid Layer, Insulating Layer
- Fit Type: Regular - Standard fit with a little bit of room to breathe, but not too baggy
- Model Features: The model wearing black is 5'10 / 150 lbs wearing a medium
- Runs True to Size
- Weight: Size Large = 19.2 oz. (544 grams)
- Style #: 723
Uses
- Ideal Seasons: Fall, Winter
- Activities: Everyday Wear, Hiking, Camping, Biking, Running, Fishing, Hunting, Snowsports
- Temperature Recommendations: 0°F and below while active, 0°F to 30°F while inactive - Learn More
Care
Washing and Drying Instructions - Learn More
- Turn Inside Out
- Machine Wash Cold: Gentle cycle with like colors
- Detergent: Mild or wool-specific
- Tumble Dry: Low heat
- Storage: Place in an airtight container when not in use for long periods of time
- Do NOT Use: Fabric softener or bleach!
Product Story
Kobuk [koe-book]
Kobuk Valley is home to a National Park, 500,000 migrating Caribou, majestic sand dunes, and the life of them all, the Kobuk River. Being so remote and with no roads leading to this beautiful place, it’s not hard to see why so few travelers make it to see the annual Caribou migration. Kobuk Valley is located inside the Arctic Circle, where temperatures can fall as low as -50 degrees Fahrenheit in the winter night.
Our Guarantee
- 30 Day Satisfaction Guarantee - Return Policy
- 1 Year Warranty
- Extended 2 Year Warranty with Registration - Learn More
- New Hampshire, USA Customer Service
You may also like
HEAVYWEIGHT MERINO WOOL
- 400+ g/m
- 100% Australian Merino Wool
- Machine Wash & Dry
- UPF 50+
Our heavyweight Merino wool is a durable, insulating layer built for long days outside. Whether you're ice fishing, working outdoors, or tackling winter chores, this fabric keeps you warm and comfortable without overheating. Layer it up or wear it on its own in the cold. You can learn more about our different Merino fabric weights here.
Temperature (°F)
Activity Level
Benefits of Merino Wool
Great 1/4 zip, love the heavyweight wool. Comfy, warm and durable (unless your 5 month old puppy chews on it all night😬).
Pricy but warm and comfortable.
I'm trying this because I've been unhappy with durability of the mid-weight equivalent. I hope I agree with my 5-star rating in a year.
I have long arms and usually need to buy a tall, but the sleeves on this are perfect.
One note - maybe it's a trick of my eyes, but the color dot for the navy is much darker than the actual garment. But the color in the larger pictures does match, so I wasn't surprised.
6' 1" 175 medium is perfect. Very comfortable and warm
- 5 stars: 40 (95%)
- 4 stars: 1 (2%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 star: 1 (2%)
Great 1/4 zip, love the heavyweight wool. Comfy, warm and durable (unless your 5 month old puppy chews on it all night😬).
Pricy but warm and comfortable.
I'm trying this because I've been unhappy with durability of the mid-weight equivalent. I hope I agree with my 5-star rating in a year.
I have long arms and usually need to buy a tall, but the sleeves on this are perfect.
One note - maybe it's a trick of my eyes, but the color dot for the navy is much darker than the actual garment. But the color in the larger pictures does match, so I wasn't surprised.
6' 1" 175 medium is perfect. Very comfortable and warm
Nice heavy weight top and great fit. Thumb holes well constructed for outdoor use and indoor you just roll cuff up. I do a lot of fishing when it’s cold and this works great to keep me warm.
I am a tall woman, this is my second purchase of this shirt. I live in it all winter, farming, logging, wore the cuffs right out! Absolutely perfect, wish it were made in the USA, but I’ve tried others, and always return to this shirt. Cannot be beat
We are happy to hear that this has become a staple in your winter wardrobe and has withstood the test of farming and logging. We are glad to know that you find it to be the perfect shirt. We appreciate your feedback- thank you for your loyalty and we look forward to serving you again in the future.
Really enjoying my Kobuk 1/4. More versatile than I was expecting. Have worn it as a base layer sitting in the deer stand in the teens with wind, and as both a base and mid layer when hiking anywhere from 0 to -35. Fit is great and able to layer accordingly with it. Excited to play around with different layering variations next winter.
Hi there!
Thank you so much for taking the time to leave such a wonderful review for our Heavyweight - Kobuk 1/4 Zip! We are thrilled to hear that you are enjoying its versatility and that it has been able to keep you warm in various weather conditions. Happy Hunting!
Best,
Sierra S
My several year old quarter zip mock t got caught by the lint filter in my dryer. It probably spun snagged by one sleeve for over an hour in a full dryer. It came out looking horrible, had a few small holes, and i thought i would be investing in another to replace it. On a whim, i ranit through the wash and threw it back in the dryer. When it finished it was back in its normal shape, with only a few small holes as a witness to its ordeal. Several years later I still wear it whenever it gets down near zero f. Same holes, same size, and as warm and comfortable as ever. Hard to believe, but true.
Dan,
Thank you for taking the time to leave a review for our Expedition 100% Merino Wool Kobuk 1/4 Zip. We are thrilled to hear that your quarter zip mock t proved to be almost indestructible, even after going through a tough time in the dryer. We take great pride in creating high-quality and durable products, and we are glad that yours stood the test of time. We hope you continue to enjoy its warmth and comfort for years to come. Thank you for choosing our brand and for sharing your experience.
Stay warm,
-Minus33 CS
I love the top. I thought expedition weight would be too much, but no. I do have different weights for different days. I will be buying more for me and my wife.
Mike,
Thank you for your positive feedback about our Expedition - Kobuk 1/4 Zip! We're glad to hear that it has exceeded your expectations in terms of warmth. We also offer different weights for varying weather conditions, so feel free to explore our options for your future purchases. Thank you for your support and we hope to continue providing you and your wife with quality merino wool products.
-Jeannie
So comfortable and great base layer. Keeps me warm fly fishing in below freezing temps without sweating from the hike into the water.
excellent. we will be ordering more soon
Barbara
Thank you for your feedback! We're glad to hear that you're enjoying your Kobuk 1/4 Zip and are planning to order more. We truly appreciate your support and look forward to providing you with more excellent products. Have a great day!
-Steven D
The Expedition Kobuk is a fantastic cold weather garment..can be used as a base layer or mid-layer insulating piece..soft and very warm..a formidable weapon against the cold...
I'm so glad you like the Expedition Kobuk! It's a great piece of clothing that can be used for a variety of purposes and the 1/4 zip comes in handy when you need to cool down a bit but can't take off any layers. Thanks for the review!
I wear this shirt all the time sometimes as just a base layer.
The fit is right on.
Merino wool never disappoints!!
Mike
Mike,
Thank you for the excellent review on the Kobuk expedition 1/4 zip. We are happy to hear that you are enjoying the fit and quality of your Minus33 gear!
Thank you for your support!
-Steven D
The thickness was amazing yet it fit without binding under my outer layers. Fit was just what I wanted not baggy or too tight. Cuffs were snug but not constrictive.
They will get the first cold weather workout from the end of November through December.I am confident they will pass the test.
Mike!
Thank you for taking the time to leave us a review! The Kobuk 1/4 Zip 100% Merino Wool is going to be a great insulator in the cold months!
Stay warm!
-Katie P.
I used as a base layer in Northern Montana when the temps dropped to near zero and a foot of snow on the ground. Stayed warm and comfortable with another mod weight minus 33 wool layer and outer layers. I am very glad I purchased before going on this trip. Can't recommend enough.
Thank you for taking the time to leave us such a great review of our Expedition 1/4 zip merino wool shirt! We are happy to hear that our gear was there when you needed it to stay warm and comfortable.
Stay warm out there!
-Minus33
But I still like it very much and plan on wearing it in layers to keep warm in the house
Stephen,
Thank you for taking the time to leave us a review! We love that you have found a use despite it not being as warm as you expected.
-Minus33
I've been switching over to wool and have tried ibex, smartwool, point6, and icebreaker gear in the 150-300 range. This 400gsm series is awesome. I ordered a medium and it would comfortably fit over a baselayer or could be worn as a baselayer just more of a loose fit (5'9" 150lb athletic). When you look at the material you'll understand why it's possible to dry it in a drier as it has a substantial heft and build quality to the knit. I'll probably still stick with air dry but I wouldn't worry if it got mixed in by accident. It's extremely soft yet robust for wool. The navy color looks far better than the picture as well and is a true navy in person. Of all the above brands the minus 33 definitely feels like it will hold up the longest by far and I look forward to getting additional wool products from them in the future. I wish they were available in store to try on which was the reason I delayed ordering so long as I prefer to test the products, but when forum posts from years back all the way to present still recommended minus 33 I figured it was worth a shot. Don't expect this to be thick like a fluffy hi pile fleece when it arrives, but do expect that it will be a nice soft and thick wool if you are more familiar with 250ish grade material.
Dan,
Thank you for taking the time to leave us such a great, detailed review! We greatly appreciate your feedback. It's so great to hear that you enjoy our 400gsm fabric so much. The garments that are made in this fabric are my personally favorites for when we get the coldest temperatures of the year. The Kobuk is one of my favorites as well because it is so versatile and can be worn as a base layer or over another base layer like you mentioned.
Thank you again for your feedback and for your support of Minus33.
-Steven D
warm, soft use for motorcycling in up state ny ride in 40's
Hey Ivy!
Thank you for leaving us a review. We are happy to hear that the Kobuk kept you warm during your chilly ride!
-Minus33
I've reached out to you many times...Why don't you offer this in charcoal grey. I'd buy 5 right now but noooo. Grey isnt important to you guys? Like... What?
As a small company, we are working on it. We thank you for your understanding and support!
Jeannie T.
Nice and warm for winter cycling.
Tom,
Happy to hear that our 100% Merino Wool Kobuk 1/4 Zip - Expedition keeps you warm for winter cycling. Thank you for taking the time to leave a review!
-Jeannie T.
…..found the perfect weight technical sweatshirt substitute. Great as a sweater, sweatshirt, mid layer and top layer in my favorite fabric….and is soft and worm. At 5’10” and 200lbs, the xl fits great and can looks good in the office too!
Alan,
We are pleased to hear that you have found the perfect weight technical sweatshirt substitute in our 100% Merino Wool Kobuk 1/4 Zip. It is one of my favorites.
Thank you for taking the time to leave a review!
-Jeannie T.
Best base heavy wool I have ever purchased. I work outside in Minnesota and I will not be taking this off. Thank you for
making such a great warm product.....FINALLY !!!
Brad,
It's great to hear that your 100% Merino Wool Kobuk Expedition 1/4 zip will be keeping you warm during the cold Minnesota winter this year! Thank you for choosing Minus33 and for leaving us a fantastic review.
Stay Warm,
-Steven D
I have been wearing Minus33 for over 6 years now-- until this purchase made direct from their website, all my others came from Amazon. All of these garments are the heavy expedition types and all are men's even though I am a senior age woman. I am outdoors every day in winter to care for animals; but the main reason I bought these items are to wear inside under my clothing because I have baseboard heat and I keep it on the lowest setting when I have to have it on at all. I live in eastern USA in mountainous region and the climate can be quite cold at times.Throughout my lifetime I have purchased cold weather gear from at least 5 of the major brands of cold weather gear. Minus33 is my favorite, in spite of the high prices. I own just about every piece they make, including socks and hats. I have the hooded jacket and two pairs of the pants and tops. I love the 1/4 zip tops. I have washed and thrown the garments into the dryer as well as drying them on the line. They hold up perfectly, including the stitching around the thumb holes, which has always been a disappointment from the other brands. They do attract pet hair, and I don't like that they are manufactured in China, except for the socks. But I consider them absolutely indispensable for my winter wardrobe and would buy again in a heartbeat.
Ruth,
Thank you very much for leaving us such an amazing and detailed review. It's the customers like yourself that make us great! I'd like to thank you for choosing Minus33 as your go to brand for your cold weather gear. It's great to hear that our garments keep you nice and toasty while you care for your animals during the cold winter months. As well as indoors, here in the eastern United States. We design our clothing to be able to be washed conveniently with the busy life styles of our customers in todays day in age and it's great to hear that all your garments have been a great example of this. A main goal for the future of Minus33 is to re-shore as much manufacturing as we can! Thanks again for the review!
Stay Warm,
-Steven D
Very warm and seems to wick well. Higher quality that other companies I've seen. Would be too warm as an undergarment if active and it's over 20.
Hi Nicholas,
The Kobuk Expedition 1/4 zip is a personal favorite of mine. I'm very glad to hear that you're enjoying the quality and function as much as I do. Thank you for the fantastic review.
-Stay warm,
-Steven D
It’s super soft and comfortable. Definitely worth the money. Sizing is normal so get what you normally get. It is the expedition weight so it can be a mid layer or outer layer.
Joe,
We are happy to hear you think our 100% Merino Wool Kobuk 1/4 Zip is super soft and comfortable.
Thank you for taking the time to leave a review!
-Jeannie T.


