mens expedition weight zip off 3/4th pants  Simply drop your shell pants, unzip the sides, and shed (or add) this layer when the time is right. Taking off your boots is now a thing of the past. This 3/4 length bottom gives you room in your boots without the bulk, yet still keeps you toasty warm with the power of our Expedition weight merino wool. Color-coordinated hook and loop closures make putting it back on quick and easy.
100% merino wool mens zip off base layer bottoms
Expedition - Chugach Men's Zip-Off 3/4 Bottoms 100% Merino Wool - Minus33 Merino Wool Clothing
100% Merino Wool Chugach Men's Zip-Off 3/4 Bottoms heavyweight base layers
mens zip off base layer bottoms zip off 3/4th pants
mens 100% merino wool zip off 3/4th bottoms velcro sides
mens 100% merino wool zip off 3/4th bottoms velcro sides
a guy zipping up his zip off pants as well as velcoring them on the side
a guy showing that you can zip up these 100% merino wool bottoms
man out hunting putting on his zip up bottoms over base layer bottoms
man out in the snow zipping up his zip off bottoms that are heavyweight and 100% merino wool

Expedition Chugach Zip-Off 3/4 Bottoms 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.

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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 13 reviews
Fly Navy
Even better than hoped for

Having been a skier for over 50 years, I’ve worn a lot of base layers and know of none other this heavy. When it is cold, this expedition weight is welcomed. Just wore these for two days skiing in New Hampshire. I was pleased in every way. Note: I’m unsure the fly is necessary.

Fly Navy,

Thank you for your feedback! We're thrilled to hear that our Expedition - Chugach Men's Zip-Off 3/4 Bottoms exceeded your expectations. Our goal is to provide high-quality and functional base layers for all types of outdoor activities. We appreciate your loyalty as a skier for over 50 years and are happy to hear that our expedition weight kept you warm during your recent skiing trip in New Hampshire. As for the fly, we understand your uncertainty. We will take note of this and consider it for future improvements. Thank you for choosing our product and we hope to continue providing you with excellent gear for your adventures.

Jeannie T.


Super warm, soft, not itchy. Honestly can’t complain

Tom S
Great garment with one suggested improvement

I am an avid outdoorsman living in Alaska. I have tried just about all of the insulating layers available in the U.S. and a few from Finland and Ireland. Minus 33 is my provider of choice. Their materials are first rate and the customer service is outstanding.

The Expedition 3/4 length zip off bottoms are well made and warm. Quality product like everything they sell. The one thing I would change with this garment is the direction of the zipper pull. The zipper, unzips from the top of the leg to the bottom. The advantage of this design is that you can unzip it part way like a shirt pit zip for ventilation.

For me, the garment will be in my backpack while hiking, then worn when not actively moving. If the zipper pull was the opposite direction, like zippered rain pants, it would be much easier to don the garment while in the field.

Hey Tom!
Thank you for taking the time to leave us a thoughtful review on the Chugach Bottoms! We are still a small company and we love hearing what our customers think. We will make sure the Product Development team know about your thoughts on the zipper.

Leif Rinearson
Love them!

These are great and serve the exact purpose I was hoping! I got them to be able to add and subtract layers under my waders without needed to take my boots off. The 3/4 length is perfect for this application because the bottoms of them don’t end up in my boots making them difficult to remove in the field. I pair them with knee high socks. I used them extensively on a recent hunt in Minnesota and was pleasantly surprised with how warm they are.


I love these! I use them for the same purpose as you - to be able to add and subtract layers without taking my boots off. They're perfect for this application because the bottoms of them don't end up in my boots making them difficult to remove in the field. I love how warm they are, too.

Jeannie T.

Jeremy Jones
Quality Zip Off Mid-Layer

Expedition Zip Off 3/4 Bottoms size: medium. My measurements: waist-32", hip-39", inseam-31". The mediums fit pretty good, a little tight through the butt and a little extra room through the waist. These pair great with a base layer and an outer layer. Very soft and very comfortable. The fly is superfluous, and they could use a bit more elastic through the waist to make them a little more snug for me; but I do have a narrow waist, so it might just be me. Highly recommend these to anyone looking for a quality mid-layer that is easy to get on and off in the field without taking your boots off.


Thank you for the great detailed feedback on your Minus33 Chugach Expedition Zip Off 3/4 Bottoms! We greatly appreciate your feedback and I will be sure to let our product development team know of your request for more elastic through the waist!

Thank you for highly recommending this product and for supporting Minus33!

-Steven D

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