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Men's Backcountry Mid-Weight Base Layer Bottoms With Fly
230 Midweight

Charcoal Heather

  • Versatile: Wear as a midweight base layer
  • Super Soft: As soft as cashmere, you will not believe this is wool - No Itch Guaranteed
  • Cozy & Warm: Our midweight merino provides you with warmth for cool fall days and cold winter days we love this weight especially for active adventures
  • Breathable & Helps Regulate Body Temp: Merino lets your body breath and keeps you warm at the same time
  • Repels Odor: No more stink like you get with synthetics
  • Wicks Moisture: Our Wool Base Layer wicks moisture away from the skin keeping you dry, warm, and feeling your best
  • Flat Lock Seams: Designed for comfort to prevent chafing
  • 3" Cuffs: Added warmth, durabilty, no riding up
  • No Roll Waistband: For all day comfort
  • Fly: Easy access
  • Gusset: For full range of motion
  • Easy Care: Machine wash & dry on low - no shrinkage 
  • Garment Weight: Size large - 8.8 ounces
  • Designed in Upstate New York - Australian Sourced Merino Wool - Made In China

Our men's merino wool base layer bottoms are the best of the best. Australian merino wool is warm, durable, breathable and soft.
No synthetic fabric performs like merino wool and no synthetic base layer bottoms perform like our Woolx 100% merino wool men's bottoms.
The 230 g/m² knit is the perfect fabric to keep you warm while active in cold temperatures. Skiing, hiking or just shoveling the driveway, the moisture wicking abilities and natural insulation properties of merino wool keep heat close to the body and draw wetness away, keeping you warm and dry when it’s cold outside and you’re sweating on the inside.
The superfine 17.5 microns merino wool is as soft as cashmere next to your skin, making Woolx the most comfortable active cold-weather merino wool base layer gear on the market.

Softest Merino Wool You Will Ever Wear...Guaranteed

Fabric Information

MIDWEIGHT 230 g/m²

100% Australian Merino Wool - 17.5 Microns
UPF Rating 50

Fabric Information

Midweight 230 g/m²

100% Australian Merino Wool - 17.5 Microns

Interlock Fabric
UPF Rating 50



Slim...Close to skin... baselayer

Sizing Information


S: 28-30
M: 32-34
L: 36-38
XL: 40-42
XXl: 44-46


S: 30-31
M: 31-32
L: 32-34
XL: 33-35
XXl: 34-36

Sizing Information


S: 28-30
M: 32-34
L: 36-38
XL: 40-42
XXl: 44-46


S: 30-31
M: 31-32
L: 32-34
XL: 33-35
XXl: 34-36


Machine Wash Cold - Tumble Dry Low
No Shrinkage Ever

It's That Simple


    Ask a Question
    • What is the material/fabric make up for the waistband? Is it a wool / elastic combination? Please let me know when you have a moment.

      The waistband on our bottoms is made entirely from elastic. The fabric of the bottoms themselves is made of 100% premium 230 g/m2 Merino Wool.

    • What is the inseam measurement on a size large?

      The approxomate inseam length for our men's bottoms are below:

      Small: 31 1/2"
      Medium: 31 3/4"
      Large: 32"
      XL: 32 3/8"
      XXL 32 7/8"

    • What is the temperature range that these are considered most effective at?

      Our midweights layers are made from a 230 g/m2 weight fabric. These are designed to keep you warm without overheating in very cold or below freezing temperatures while engaging in vigorous activity. Like running or x-country skiing in below zero temps. They are also a perfect layer to keep you warm in less freezing conditions while you're sedentary, or engaged in less intense activities. They are a great layer to keep toasty while walking the dog or watching your kids outdoor sports in temps ranging in the 30's and 40's.

      Our 400 g/m2 heavyweights are our warmest fabric and provide the ultimate in insulation during prolonged sedentary activities in very cold temperatures or in extreme cold conditions. They are ideal when you will be out in below zero temps all day sitting or standing, like while ice fishing or operating machinery in winter conditions. They provide extreme warmth for extreme conditions and are a great 1st base layer for intense cold weather. Several Iditarod mushers have worn these as a base while racing in temperatures as low as -40 degrees and enduring intense winter weather. The ideal base layer weight depends on the conditions you'll be facing, the activities you'll be engaged in, and quite a bit on your own personal cold tolerance levels. For some the heavyweight is way too warm for anything but the coldest arctic temperatures, while others find them comfortable to wear indoors in a cold house.

      All of our weights offer the wonderful natural moisture management and odor destroying features of merino wool, and are incredibly soft. They are designed to be worn right next to your most sensitive skin.

    • What are the front rise and back rise dimensions? Particularly the small and medium. Thanks

      Here are the approximate front and back rise measurements for our men’s leggings. These are measured from the top of the waistband to the gusset panel seam. SMALL Front Rise: 8 3/8” Back Rise: 7 ½”   MEDIUM Front Rise: 9 1/8” Back Rise: 8 ¼ ‘   LARGE Front Rise:  10” Back Rise: 9”   XL Front Rise: 10 5/8” Back Rise: 9 ¾”   XXL Front Rise: 11 5/8” Back Rise: 10 ¾”

    Customer Reviews

    4.8 Based on 29 Reviews
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    100reviewers would recommend this product Write a Review Ask a Question
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    Stann C.
    United States
    I recommend this product

    Merino wool

    Excellent. Comfortable, warm, soft and not itchy.

    Frank G.
    United States

    Is excellent no complaints

    Everything that I have purchased through the years from WOOLX Is excellent no complaints

    philip m.
    United States


    Good however did not have my size in some garments


    Performed well in all temps

    We just completed a trip to Svalbard and Norway. Please see my full review for real-world testing at the northernmost settlement on earth at

    Jeanne B.
    United States

    Best bottoms for people who go outside in Midwest and western winters

    Warm in the worst weather, soft, wash and air dry in winter. At forty below I wore two pairs together. I strongly recommend these bottoms for comfort, durability, wearability and quality of workmanship. I bought several pieces from Woolx and have the best wardrobe ever. They are the heart of my minimalist wardrobe and worth every penny.

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