100% Merino Wool Katmai Men's Bottom - Expedition Weight
100% Merino Wool Katmai Men's Bottom - Expedition Weight
100% Merino Wool Katmai Men's Bottom - Expedition Weight
100% Merino Wool Katmai Men's Bottom - Expedition Weight
100% Merino Wool Katmai Men's Bottom - Expedition Weight
100% Merino Wool Katmai Men's Bottom - Expedition Weight
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool
Expedition - Katmai Men's Bottom 100% Merino Wool

Katmai Men's Bottom

100% Merino Wool

Regular price$139.99
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 116 reviews
My Go To Winter Base Layer

These expedition weight bottoms have become my most used base layer bottom. Because wool has a wide temperature comfort range, I can wear these under thin pants in cold weather, under down pants in bitterly cold weather, and by themselves as indoors loungewear. In fact, they are more comfortable than sweatpants! Part of that is due to the extremely comfortable waistband that doesn't dig or roll.

Living in Northern Virginia, our winters are not that bad, but still these are my go to. The only times I don't use these in the winter is if we have a warm snap, or if I am doing strenuous exercise in temps above 20 degree Fahrenheit. With the "Expedition" label, it's easy to assume these would be a rarely used specialty piece, but they are so much more.


Thank you for providing such great detailed feedback on your Minus33 Katmai Men's Expedition Bottoms! We are happy to hear that they serve you well in so many different ways, during the winters down in Northern Virginia. The natural properties of merino wool, allow a heavier piece like the Katmai bottoms to be very breathable and able to be worn in a variety of different temperatures, even when it is not extremely cold, as you've found with your experience with wearing these bottoms. Thank you again for taking the time to share your feedback and experience with us, we greatly appreciate it!


-Steven D

Jeroen H.
Unbelievable quality!!

This product is exceptional. It looks like fine woven cotton, but it feels much more pleasant. And it isolates very well. Unfortunately I can only really test it next winter. I drive my motorbike throughout the winter, and these pants should really help!


Thanks for the review! We're glad to hear that you're happy with the quality of your 100% Merino Wool Expedition Katmai Men's Bottoms. We're excited to see how they perform on your cold weather motorbike rides!


-Steven D

Tom S
Quality merino garment

After trying just about every synthetic insulating layer and various wool garments, my preferred material is merino wool. Minus 33 provides a quality product with great customer service. I am an outdoor photographer living in Alaska. Clothing is an essential piece of kit if you are going to be outdoors for an extended period of time. I have numerous insulating layers from Minus 33. The expedition weight Katmai bottoms are my most recent purchase from Minus 33. These bottoms are comfortable, and very warm. Thank you Minus 33 for another well made garment!


Thank you for your review of our 100% Merino Wool Katmai Men's Bottom - Expedition. We're glad you've found our product to be of quality and enjoy our customer service. We're glad to hear you're a fan of our products and that they help you to be outside in the elements doing what you love, we appreciate your feedback!

-Jeannie T.

Welch Tester
Warmth precious warmth

As an older man that works outside, sometimes 10 degrees or less, I can appreciate Merino wool. Thank you for base layers


Thank you for your review. We're glad to hear that our 100% Merino Wool Katmai Men's Bottom - Expedition is keeping you warm!

-Jeannie T.

Linda L Johnson

These were a gift. The recipient loves them. Keeps him warm doing outdoor activities.

Thank you for your feedback! We're glad to know that our 100% Merino Wool Katmai Men's Bottom - Expedition are keeping them warm!