Minus33 Merino Wool Clothing Midweight Wool Union Suit
Minus33 Merino Wool Clothing Midweight Wool Union Suit
Minus33 Merino Wool Clothing Midweight Wool Union Suit
Minus33 Merino Wool Clothing Midweight Wool Union Suit
Minus33 Merino Wool Clothing Midweight Wool Union Suit
Minus33 Merino Wool Clothing Midweight Wool Union Suit

100% Merino Wool
Union Suit


Regular price $169.99 Save $-169.99
Shipping calculated at checkout.

True Red

The Union Suit is a historical undergarment that has been around since 1868. The Union Suit was first created in Utica, NY. Our Union Suit features a drawstring waist, plastic buttons on the top half, and flat snaps on the bottom half.

  • Fiber Content: 100% Merino Wool
  • Knit: 235 g/m2 Midweight Interlock Knit
  • Microns: 18.5 Micron Fibers
  • UPF Rating: 50+
  • Total Easy Care: Machine Wash and Dry
  • Wool Source: Australia
  • Imported.
  • Button-Up: Buttons up the front torso, with snaps on the lower half, extra button provided on care label
  • Rear Opening: Low profile, snap opening
  • Neckline: Henley Y-Neck
  • Thumbholes: Allow for easy layering and added hand warmth
  • Waistband: Adjustable drawcord
  • Ribbed Ankle Cuffs: Keep in place and allow for easy layering
  • Tagless Label: No Itchy Neck Tags
  • Flat Lock Seams: Prevents Chafing
  • Layer Type: Base Layer, Mid Layer
  • Fit Type: Regular - Standard fit with a little bit of room to breathe, but not too baggy
  • Model Features: The model in true red is 5'10 / 150 lbs wearing a medium
  • Runs True to Size - Our previous production ran large but has since been corrected to be true to size. For fit advice, we recommend contacting our customer service to get the right fit, since we have some mixed inventory.
  • Weight: Size Large = 21.6 oz. (612 grams)
  • Style #: 4920
    • Ideal Seasons: Spring, Fall, Winter
    • Activities: Everyday Wear, Hiking, Camping, Biking, Running, Fishing, Hunting, Snowsports
    • Temperature Recommendations: 30°F to 0°F while active, 30°F to 60°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!
      Couple Wearing Minus33 Midweight Merino Wool Base Layer Outfits

      Merino Wool

      Versatile and comfortable, our Merino Wool will always have your back. Designed as a three-season garment, our Midweight works great as either a base or mid layer.

      Midweight Details

      Our Midweight styles have all the same natural qualities as our Lightweight Merino Wool, with greater insulation. Minus33 Merino Wool Clothing is perfect as a base layer for a day on the slopes or as an emergency pullover when a cold front rolls in just before you summit.

      235 g/m2

      Interlock Knit

      18.5 Micron

      100% Merino Wool (Woolverino 85% Merino Wool)
      UPF Rating 50+

      Compare Weights


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

      Seasons: Spring, Fall, Winter.

      High Activity Temperatures: 0°F to 30°F

      Low Activity Temperatures: 30°F to 60°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 6 reviews
      Kevin Charron
      Great piece of kit

      Great garment for cold weather pursuits. Fairly light and compressible for the weight of wool used. My only gripe would be the use of buttons instead of a zipper, but it is only a minor inconvenience in all fairness. The buttons hold well and I cannot feel any noticeable heat leak when using this appropriately as a baselayer. Overall great product for the price. Oh, and a black color option would be nice as well. Keep up the good work.

      Bishop New
      My Favourite Go-To

      I wear this for long distance nordic skating, snowboarding down couloirs & other high alpine descents, under my drysuit on the river in winter, and numerous other activities that demand a great warmth to weight ratio. I have two of these, and they are hands down the best midweight garment I have ever had the pleasure of owning. I love the buttons instead of a zipper (please never change this). The thumb loops make entry into my drysuit or other outer layers incredibly simple. I would definitely recommend against wearing any bottoms under these, doing so renders the button relief portion useless. I would highly suggest wearing a micro or lightweight top in extreme cold, but honestly that's not necessary for most of what I do since I'm moving a lot. On a side note, everyone who sees it immediately inquires where to get it, I'm not sure how many have decided to put down the cash, I would say if you're contemplating this versus an individual top & bottom, get this!

      I know it's hard to trust a review that doesn't have cons. I haven't had an experience yet that would warrant one, then again I've had my first one for about 2 months if I recall correctly. If I had to be really nit-picky, I'd say it's a downside that it's only in red, I'd love to see a version in black.


      We are ecstatic to hear that you are really happy with our 100% Merino Wool Union Suit - Midweight, and that its a conversation piece. We will pass your color recommendation along to our product development team.

      Thank you for taking the time to leave a review!

      -Jeannie T.

      M New
      Instant classic!

      First thing I put on in the morning! Perfect weight and a great fit. Fantastic part of the kit, thought it was a bit of a whim, but quickly became my go-to. Couldn’t be improved!

      Very nice

      This purchase was a gift for my husband. He absolutely loved them calling them perfect. Comfortable, and warm, a oerfect base layer.


      We are pleased that your husband thinks our 100% Merino Wool Union Suite is a perfect base layer.

      Thank you for the great review!

      -Jeannie T.

      Justin Sweed

      I love this one peace. It’s extremely comfortable and cozy.

      You may also like