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

100% Merino Wool
Katmai Men's Bottom

Expedition Weight

Regular price $119.99 Save $-119.99
Shipping calculated at checkout.


The Katmai is our Expedition weight bottoms, made with 100% fine Merino Wool. You will barely notice these long johns as they are snug fitting and soft next to the skin. While in the wilderness, the odor-free properties of Minus33 Merino Wool will be appreciated by hunters and backpackers alike. When you need to be warm the Katmai is the garment for you.

  • Fiber Content: 100% Merino Wool
  • Knit: 400 g/m2 Expedition Interlock Knit
  • Microns: 18.5 Micron Fibers
  • UPF Rating: 50+
  • Total Easy Care: Machine Wash and Dry
  • Wool Source: Australia
  • Imported.
    • Mid Rise: Waistband sits a little below the belly button
    • Covered Waistband: Merino next to your skin
    • Gusset: Reduces stress in the crotch area
    • Ribbed Ankle Cuffs: Keep in place and allow for easy layering
    • Flat Lock Seams: Prevents Chafing
    • Layer Type: Base Layer
    • Fit Type: Regular - Standard fit with a little bit of room to breathe, but not too baggy
    • Runs True to Size
    • Weight: Size Large = 14.4 oz. (408 grams)
    • Style #: 709
      • 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

        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

          Katmai [kat-mahy]

          Mt. Katmai is located in the Katmai National Park which is located in southwestern Alaska and is home to the Valley of Ten Thousand Smokes. This huge northern wilderness area is untamed and full of wildlife.

          MERINO WOOL

          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?

          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 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.

          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.

          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.

          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+.


          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. 



          Learn More

          Customer Reviews

          Based on 62 reviews
          David Brown
          Katmai Base layer 400 gram

          The weather for duck hunting in Arkansas is strange. One day it might be 60 and you are swatting bugs or the next it might be 35 for the high. The sort of hunt that we partake in involves sitting for hours at a time in subfreezing conditions with little or movement. Getting to the blind involves a boat ride of about 20 minutes at 5AM I am getting older and I find that I am more susceptible to cold than I was in my younger days. I have some merino wool blend bottom I wear as a layer under some fleece wader pants then a pair of windproof and water repellent bibs on top. This particular setup has always served me well, but I thought there might be something better out there.
          I always wanted a 100 percent merino wool base layer but did not want to pay the price. Finally I pulled the trigger after doing some research, found the 400 gram wool was about the best. Minus 33 was listed in the top ten brands. I ordered directly from the company instead of ordering through a secondary retailer. I called and ordered the bottoms, they were expensive but I felt this was the best bang for the buck. The customer service lady was excellent and my package arrive in less than a week.
          After ordering I felt a little apprehensive but the package arrived and all that vanished. The bottoms are not heavy. The fit is excellent, I wore them around the house for several days as duck season was not yet open. I am going on a hunt in 2 days where the projected low will be about 25F. Will continue the review after the hunt.
          Wore them on a hunt the low was 24 degrees and the wind was blowing about 25mph out of the north. The new merino 400 gram bottoms did the trick and I was warm all morning.
          I do recommend the Minus33 brand and will purchase the top at a later date. 5 stars for excellent merchandise and customer service. They are made in China, but don’t let that influence your decision not to purchase. Quality is excellent.

          Thank you for the in depth review as well as the ongoing feedback! As always just reach out to us if you need anything we'll be happy to assist!

          K JENSEN
          As always great quality from MINUS33

          I have many MINUS33 items. These are a must when outside in negative temps.

          They definitely are! Thank you for your review.

          I Purchased Expedition…

          I Purchased Expedition Weight Katmai Bottoms And Yukon Crew Top In December 2019 For The January 2020 Missouri Deer Season. Was Not Sure I Wanted To Spend This Much However After Seeing Reviews I Thought I Would Try Them. Why Did I Wait? These Were The Most Comfortable And Warm Base Layers I Have Ever Owned. I Also Purchased The Mid Weight Balaclava In Mossy Oak Breakup. When It Arrived I Thought This Item Can't Be That Good As It Was So Thin. Again I Was Wrong. In 20 Degree Windy Conditions I Was Very Comfortable. These Are Quality Products And Worth The Price.

          Aaron Milton
          Top notch

          Great customer service after ups screwed up royally.

          Mark R
          Warm and very comfortable

          I love them, soft, warm. Just great, alot better than any polly I’ve had.

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