Minus33 Merino Wool Clothing Kobuk Expedition Wool 1/4 Zip
Minus33 Merino Wool Clothing Kobuk Expedition Wool 1/4 Zip
Minus33 Merino Wool Clothing Kobuk Expedition Wool 1/4 Zip
Minus33 Merino Wool Clothing Kobuk Expedition Wool 1/4 Zip
Minus33 Merino Wool Clothing Kobuk Expedition Wool 1/4 Zip
Minus33 Merino Wool Clothing Kobuk Expedition Wool 1/4 Zip
Expedition - Kobuk 1/4 Zip 100% Merino Wool
Expedition - Kobuk 1/4 Zip 100% Merino Wool
Expedition - Kobuk 1/4 Zip 100% Merino Wool
Expedition - Kobuk 1/4 Zip 100% Merino Wool
Expedition - Kobuk 1/4 Zip 100% Merino Wool
Expedition - Kobuk 1/4 Zip 100% Merino Wool

Kobuk 1/4 Zip

100% Merino Wool

Regular price$159.99
Shipping calculated at checkout.
Size chart


Please note, measurements refer to body size, not garment dimensions, unless otherwise noted. Measurements are in inches.

Men's Clothing Size Chart

Size Chest (in) Waist (in) Sleeve Length (in) Shirt Length (in) Inseam (in)
XS 33-35 24-27 30-31 25.5-26.5 25-27
S 35-38 28-30 31-32 26.5-27.5 28-30
M 39-41 31-33 32-33 27.5-28.5 29-32
L 42-45 34-36 33-34 28.5-29.5 32-34
XL 46-48 37-40 34-35 29.5-30.5 32-35
XXL 49-52 41-44 35-36 30.5-31.5 34-35
XXXL 52-54 45-49 36-37 31.5-32.5 34-36

Men's Big and Tall Clothing Size Chart

Size Chest (in) Waist (in) Sleeve Length (in) Shirt Length (in) Inseam (in)
MT 39-41 31-33 35-36 30.5-31.5 32-34
LT 42-45 34-36 36-37 31.5-32.5 33-36
XLT 46-48 37-40 37-38 32.5-33.5 33-36
2XT 49-52 41-44 38-39 33.5-34.5 34-36
3XT 52-54 45-49 39-40 34.5-35.5 35-37
4X 54-57 49-52 36-37 32.5-33.5 34-36
4XT 54-57 49-52 40-41 35.5-36.5 35-37
5X 57-59 52-54 36-37 33.5-34.5 34-36
6X 59-61 54-56 37-38 34.5-35.5 34-36

How to Measure

Chest: Measure the circumference around the fullest part of your chest, underneath the arms.

Waist: Measure the circumference around the natural waist, near the belly button.

Sleeve: Measure from your center back neck, to the elbow, to the wrist.

Shirt Length: This measurement refers to the approximate size of the shirt back length, from the neck to the bottom hem.

Inseam: Measure from the center of the crotch to the end of the ankle.

Shop Men's Clothing Shop Men's Big and Tall Clothing

Fit Types

Athletic Fit

Regular Fit

Relaxed Fit

Athletic Fit Regular Fit Relaxed Fit

Fits best as: Base Layer

Skin tight, slim, compression style fit. Wear this layer first and add on top of it if needed.

Fits best as: Base Layer, Mid Layer

True to size, standard fit with a little bit of room to breathe, but not too baggy. Perfect on its own or with a t-shirt or thin shirt underneath.

Fits best as: Mid Layer, Insulating Layer, Outer Layer

A little more room than you would find in a Regular fit. Enough space to fit 1-2 layers underneath.

Fit FAQs

What if I am between sizes?

If you are between sizes, we recommend sizing up or down based on what fit type you would prefer, and based on how you plan to wear the piece. Our knitted merino is stretchy and you could realistically go with either size. If you would prefer an Athletic fit, size down. If you prefer a Regular or Relaxed fit, size up.

Do I need to size up/down to layer?

Generally, no, you do not need to purchase a different size than normal. Our base layers are designed to fit right into your current layering system. They are also designed to work with other products in our line, too. You may wish to adjust your sizing if you plan to wear one of our garments in a way that it is not intended, if that's the case please feel free to contact our customer service team for help.

Does your clothing run true to size?

Yes, our clothing runs true to size and is sized similar to most other American brands. If a sizing discrepancy is discovered, you will see fit advice in that product's specific listing.

Not sure what size or fit type you need?

Learn more about layering systems and how they can help you choose. Still need help? Contact our customer service team for personalized advice.

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Our Guarantee
man sipping up his expedition weight 1/4 zip man sitting down wearing expedition weight bottoms


On the coldest, darkest nights, you will discover yourself seeking the warmth of Minus33 Merino Wool. Our Expedition products are suitable for the coldest climates and true expeditions.

Expedition Details

Originally designed for winter mountaineering on Mount Washington, Minus33 Expedition Weight clothing has seen action in both the Antarctic and Arctic, and even to the Summit of Mount Everest. Anyone venturing out in the cold will greet our Expedition clothing with a warm welcome as either a base, mid or outer layer. When you need to keep the ever-present cold from seeping in, our Expedition items will be your best friend.

400 g/m2

Interlock Knit

18.5 Micron

100% Merino Wool
UPF Rating 50+

Compare Weights


Activities: Hiking, Camping, Lifestyle, Snowsports, Hunting, Ice Fishing.

Seasons: Fall, Winter

High Activity Temperatures: 0°F and below

Low Activity Temperatures: 30°F to 0°F

Learn About Layering

Why Merino Wool?

two people sitting next to a river wearing merino wool

Moisture Wicking

Minus33 Merino Wool regulates the amount of moisture on your skin by absorbing any moisture or sweat on your body. Then, the absorbed moisture evaporates out of the fabric into the atmosphere.

merino wool tshirt drying in the sun


Merino Wool fibers naturally reject any bacteria in moisture or sweat as it is wicked away, so foot fungus and smelly odor will not be a problem while wearing our products.

woman hiking with her dog crossing a river

Insulates When Wet

Wool will absorb up to 30% of its weight in moisture without feeling wet or clammy. If you do get wet, wool will insulate you better than cotton or polyester materials.

first responder at a fire

Fire Resistant

Merino Wool insulates against high temperatures and does not readily catch fire. If it does, it self-extinguishes. When Merino burns, it doesn’t melt and stick to the skin like synthetic fabrics do.

woman doing yoga on top of a mountain in merino wool base layers

UV Protection

Don’t worry about sunburn on a sunny day summiting a peak. Lightweight layers have a UPF rating of 25. Midweight and Expedition have a UPF rating of 50+.

Australian merino wool sheep


Merino Wool has a low environmental footprint and naturally returns to the elements. Shear a merino sheep in the morning, and in the afternoon they’re happily nibbling their way towards renewing next season’s clip. 



Total Easy Care (TEC) Merino apparel is designed for today's busy lifestyle. Total Easy Care Merino garments are all machine-washable, and are suitable for tumble drying.

Even after frequent laundering they retain an 'as new' appearance. They won't shrink, lose their shape, fade or color-bleed. They remain soft and comfortable for the life of the garment.

Customer Reviews

Based on 25 reviews
Moose34d Mahan
But why not charcoal?

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.

Tom B
Kobuk 1/4 zip

Nice and warm for winter cycling.


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.

Alan S

…..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!


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.

Brad Ruchti
Great Base Layer

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 !!!


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

Ruth Coleman
Absolutely Indispensable

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.


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