Flat front view of tan Woolverino micro weight merino wool boxer briefs on a white background, showing the wide waistband, contoured pouch, flat seams, fitted legs, and smooth hem openings
Minus33 Merino Wool Clothing Woolverino Men&
some of the most comfortable merino wool underwear for men
Back view from waist to upper thighs of a man wearing tan Woolverino micro weight merino wool boxer briefs, showing the wide waistband, smooth rear panel, fitted legs, and flat seams
Minus33 Merino Wool Clothing Woolverino Men&
Front view from waist to upper thighs of a man wearing olive drab green Woolverino micro weight merino wool briefs, showing the elastic waistband, contoured front pouch, high-cut leg openings, and close fit
Left side view from waist to upper thighs of a man wearing olive drab green Woolverino micro weight merino wool briefs, showing the elastic waistband, smooth side panel, high-cut leg opening, and close fit
Back view from waist to upper thighs of a man wearing olive drab green Woolverino micro weight merino wool briefs, showing the elastic waistband, smooth rear panel, high-cut leg openings, and close fit
Minus33 Merino Wool Clothing Woolverino Men&
Back view from waist to upper thighs of a man wearing ash gray Woolverino micro weight merino wool briefs, showing the elastic waistband, smooth rear panel, high-cut leg openings, and close fit
Left side view from waist to upper thighs of a man wearing ash gray Woolverino micro weight merino wool briefs, showing the elastic waistband, smooth side panel, high-cut leg opening, and close fit
Front view from waist to upper thighs of a man wearing ash gray Woolverino micro weight merino wool briefs, showing the elastic waistband, contoured front pouch, high-cut leg openings, and close fit
Minus33 Merino Wool Clothing Woolverino Men&
Back close-up from waist to upper thighs of a man wearing black Woolverino micro weight merino wool briefs, showing the elastic waistband, smooth rear panel, high-cut leg openings, and close fit
Right side close-up from waist to upper thighs of a man wearing black Woolverino micro weight merino wool briefs, showing the elastic waistband, smooth side panel, high-cut leg opening, and close fit
Minus33 Merino Wool Clothing Woolverino Men&
some of the most comfortable merino wool underwear for men
Front view from waist to upper thighs of a man wearing navy Woolverino micro weight merino wool boxer briefs, showing the wide waistband, contoured front pouch, fitted legs, and flat seams
Back view from waist to upper thighs of a man wearing navy Woolverino micro weight merino wool briefs, showing the elastic waistband, smooth rear panel, high-cut leg openings, and close fit
best Merino Wool underwear briefs
Merino Wool underwear briefs best & most comfortable
best Merino Wool underwear briefs
Merino Wool underwear briefs best & most comfortable
best Merino Wool underwear briefs
Merino Wool underwear briefs best & most comfortable
Merino Wool underwear briefs best & most comfortable
best Merino Wool underwear briefs
best Merino Wool underwear briefs
Merino Wool underwear briefs best & most comfortable

Microweight 145 Men's Wool Briefs Woolverino

Regular price$34.99
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Color
Size
Size chart

Measurements

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.

  • In stock, ready to ship
  • Backordered, shipping soon
OEKO-TEX Standard 100

This certified product has been tested against a list of over 1,000 harmful substances, including PFAS.

Woolmark Certification

This certified product meets Woolmark standards, ensuring exceptional quality, reliability, and performance.

Our Guarantee

runners wearing minus33 microweight merino sun hoodie and merino wool pullover and wool sweater

MICROWEIGHT MERINO WOOL

  • 145 g/m
  • 84% Merino Wool, 13% Nylon, 4% Spandex 
  • Tested safe against over 1000 harmful chemicals including PFAS
  • Machine Wash & Dry
  • UPF 20

Our microweight Merino wool is our lightest and most breathable fabric. It’s designed for high-output activities in warm to hot conditions. Perfect for hiking, running, biking, and everyday wear when you need sun protection and moisture management without extra bulk. Our Microweight fabric also works great as a base layer in spring and fall. You can learn more about our different Merino fabric weights here.

Temperature (°F)

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0°-30°
30°-60°
60°-90°

Activity Level

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LOW
MEDIUM
HIGH
  • 5 stars: 24 (69%)
  • 4 stars: 4 (11%)
  • 3 stars: 3 (9%)
  • 2 stars: 1 (3%)
  • 1 star: 3 (9%)
R
RDJ (Milton, US)
Black / S
Height: 5’ 7”
Weight: 162
Primary Activity: Casual / Lifestyle
I ordered the micro weight briefs in black, small

I ordered the micro weight briefs in black, small size. Ordered 3 pair.
Fit perfect….very comfortable. No issues with stiching. Quality is very good.
Only complaint is the price. That little bit of material on briefs is pricey!
Just like the Tshirts I’ve bought and other Minus 33 clothes. Pricey!
I order from other merino wool companies mixing things up some. They’re all pricey.
I wear wool tshirts in the Florida summer weather. Much better than cotton.

Hi Royce, thank you for sharing your experience! We're glad the briefs fit well and meet your expectations. We appreciate your feedback on the price—quality merino wool is a bit of an investment, but we're happy it works well for your Florida summers. Thanks for being a valued customer!

Thank you for taking the time to share your review! We’re glad to hear that your Microweight Briefs fit perfectly, feel very comfortable, and are keeping you cool down in the Florida summer heat—merino wool really is a game-changer compared to cotton!

We completely understand your feedback regarding price. We put a lot of care into using high-quality merino wool, thoughtful craftsmanship, and rigorous quality standards across all our gear.

Because we truly stand behind every product we make, we back our gear with solid coverage: all of our apparel comes with a 1-year warranty against manufacturing defects, and our USA-made socks carry an incredible 5-year warranty. We want you to feel confident that your investment with Minus33 is built to last.

Thank you again for your support and for choosing Minus33 to keep you comfortable year-round!

Cory & The Minus33 Customer Care Team

A
Anonymous (Montreal, CA)
Tan 499 / L
Primary Activity: Casual / Lifestyle
Popped stitches out of the packaging

Not super satisfied with product quality with some stitches being popped right out of the packaging, which will only get worse with time I imagine and make these some not very long lived 50$ undies.

For what it's worth and with regards to others complaining about loose fit around the thigh and groin, I find them perfect in that regard since I have very developed thigh muscles.

Hi there, thank you for sharing your feedback. We're sorry to hear about the stitching issue and appreciate your insights. Please reach out to our support team so we can assist you further. We hope to improve your experience with us!Thank you for taking the time to share your feedback on your recent orders. We are truly sorry to hear about the popped stitches on your Microweight Briefs right out of the packaging, as well as the sizing and fit inconsistencies you experienced across the different styles. That is certainly not the level of quality or fit reliability we strive to deliver.

We would love the opportunity to make this right for you:

1-Year Warranty & Defect Replacement: Your Microweight Briefs are fully covered under our 1-year warranty against manufacturing defects. We would be happy to replace the damaged pair right away.

Exchanges & Returns: For the Lightweight Boxer Briefs and Microweight Boxer Briefs that ran too tight, our team can quickly assist you with setting up an exchange for a size up or processing a hassle-free return.

Please reach out to us directly at info@minus33.com with your order number so we can get your replacement and exchanges taken care of immediately. We also appreciate your detailed notes regarding the thigh and groin fit versus the waist sizing—feedback like yours is invaluable.

Cory at Minus33 Customer Care Team

A
Anonymous (Ponte Vedra Beach, US)
Black / L
Height: 73 inches
Weight: 176
Great product

Great product. Seems slightly large.

Hi there! Thanks for the great review. We're glad you like the Woolverino briefs. If they're a bit large, you might consider sizing down for a perfect fit. Thanks for shopping with us!

Linda
Minus33 Customer Service Team

T
Terrance

The only underwear that I wear!

A
Anonymous (Los Angeles, US)
Ash Gray / S
Height: 182cm
Weight: 56kg
Comfortable

More comfortable than expected

Thank you for taking the time to leave a review. We are thrilled to hear that you find our Microweight Men's Wool Briefs even more comfortable than expected. That is music to our ears!

We strive to provide our customers with the best possible experience, and we are delighted to know that we have succeeded with you. If you have any further feedback or suggestions, please do not hesitate to let us know.

Thank you again for choosing our product. We truly appreciate your support!

W
Warren

Great product. Feels wonderful!

Good morning Warren,

Thank you for leaving a review for our Men's Wool Briefs in Woolverino. We're thrilled to hear that you find them comfy and love the feel of the fabric. We take pride in creating products that are perfect for all seasons. Thank you for choosing our product and for taking the time to share your feedback.

Linda
MInus33 Customer Service Team

T
Terrance

Always cool and comfortable. I won’t wear anything else. I wear merino underwear, t-shirts and socks year round for the best comfortable and odor control.

A
Anonymous (Saint James, US)
Navy / L
Height: 5'9"
Weight: 185
Primary Activity: Casual / Lifestyle
Mens merino briefs

Well made,extremely soft,fit is great,runs true to size

A
Adam (Olympia, US)
Height: 6'7"
Weight: 200lbs
Primary Activity: Workwear
Rides up like crazy

Never had this issue with other undies, I thought maybe I was immune! I can't wear these because they ride right up and stay there. No issue with any other minus33 products.

R
Ronald T. (Kalispell, US)
Olive Drab Green / L
Perfect weight!

Love these briefs and also have the boxers. Perfect weight, very comfortable!

T
Toby (New York, US)
Black / M
Seems cheaply made

Started to fray and come apart after first wash. Very unhappy with purchase

We’re sorry to hear the item didn’t meet your expectations. We understand how frustrating it is when a product doesn’t hold up after the first wash. We’re glad your return is already in process and appreciate your feedback- it helps us continue improving our products.

D
Dmytro

V nice

A
Anonymous (Marshall, US)
Black / S
Height: 6' 0"
Weight: 176
Primary Activity: Casual / Lifestyle
All the great features

Super comfy, great feel to fabric, coolest in summer. The best feature is the fly front!

Thank you for leaving a review for our Microweight Men's Wool Briefs in Woolverino. We're thrilled to hear that you find them super comfy and love the feel of the fabric. We take pride in creating products that are perfect for all seasons and we're glad to hear they keep you cool in the summer. Thank you for choosing our product and for taking the time to share your feedback.

Best,

Minus33 Customer Service

R
Ron H. (Sacramento, US)
Ash Gray / L
Height: 5’10”
Weight: 195
Primary Activity: Casual / Lifestyle
Love these briefs

Without getting too graphic as to why - I love these briefs. They keep me comfortable and dry while traveling by air and walking in sticky weather, like D.C. I have since purchased more. Sizing is true.

Hi there,

Thank you for your amazing review! We are thrilled to hear that our Microweight Wool Briefs have met all your needs for comfort and convenience. We are glad to know that they are perfect for both travel and hot days.

We are also happy to hear that you appreciate the fit and color choices of our briefs. We put a lot of thought into designing them to ensure they meet our customers' expectations.

Thank you for choosing our product and for taking the time to share your experience. We hope to continue providing you with excellent products in the future.

Best,
~Sue
Minus33

T
Terrance L.C. (Limington, US)
Olive Drab Green / S
The best!

With hypersensitivity due to neurological and autoimmune diseases, it’s challenging to find clothing that I can wear that doesn’t make me break out or be uncomfortable in some way. I discovered that merino wool shirts and socks are a perfect solution, so I decided to try underwear. There are other brands that offer them, but none have the fit and feel of the briefs from Minus 33. Now I need to stock up! Thanks for what you do!

Hi Terrance!
We are so grateful to hear that our Microweight Woolverino briefs have been the perfect solution for your hypersensitivity. We understand how challenging it can be to find comfortable clothing, and we're thrilled that our briefs have met your needs. Thank you for your kind words and for choosing Minus 33. We're always here to help, so don't hesitate to reach out if you ever need anything. Take care!
Kindly,
~Sue

A
Anonymous (Ferguson, US)
Olive Drab Green / S
Light weight breathable but tad too big

I like the light weight and breathable material. The fit is ok at waist but too loose every where else. I’m 5’10”, 145 lbs and 30” waist. Fit of size small is too loose.

Hi Kevin,
Thank you for taking the time to leave a review for our Microweight Men's Wool Briefs Woolverino. We're glad to hear that you appreciate the light weight and breathability of the material. We understand that the fit may not be perfect for you and we apologize for any inconvenience this may have caused. We appreciate your feedback and will take it into consideration for future improvements. If you need any further assistance, please don't hesitate to reach out to us. Thank you!
Kindly,
~Sue

P
Pedro P. (Houston, US)
One Size Too Large

I use and bought medium size briefs, but these are a bit too loose, so I bought a size small and they fit perfect.
They are very soft and comfortable if you get the right size for you, and I've use them about 50 times!

Hi Pedro,

Thank you for taking the time to leave a review for our Micro Weight - Men's Wool Briefs Woolverino. We appreciate your feedback and are glad to hear that you found the briefs to be soft and comfortable. We apologize for any inconvenience caused by the sizing issue, and we are happy to hear that you were able to find the perfect fit with a size small. We hope you continue to enjoy our product for many more uses to come. Thank you for choosing our brand!

-Jeannie

T
Tom (Colchester, US)
Olive Drab Green / M
Comfortable

I purchased these to wear in the winter during runs to keep those important parts warm. I have not yet had a chance to use them during extremely cold weather, but am glad to report that did a great job of keeping everything in its place and I was very comfortable. So far I have done two 7 mile runs when the temperatures were between 35 - 40 degrees with them with no problems.

Tom,

Thank you for taking the time to leave us a review! We're happy to hear that our Micro Weight Wool Briefs were able to keep you comfortable during your runs in colder weather. We hope they continue to perform well for you during extremely cold temperatures.

-Jeannie

A
Anonymous
Best underwear period.

I had always heard that wool underwear were the best to regulate body temperature but my experience with wool had always been unpleasant to say the least. These have changed that thought process completely.

D
Daniel O. (Brooklyn, US)
Black / 2XL
Underwear

Fits perfect. Very comfortable. Will be buying more. I highly recommend them.

Daniel! Thank you for taking the time to leave a review for our Micro Weight Men's Wool Briefs. We're so glad to hear that they fit perfectly and are comfortable for you. We appreciate your recommendation and look forward to providing you with more of our Woolverino products in the future. Have a great day!

U
UGA89 V. (Athens, US)
Tan 499 / L
Nice fabric, so-so fit

The fabric on these are nice, very soft. However, the fit has a lot to be desired.

UGA89,

Thank you for taking the time to leave a review. We're glad to hear that you appreciate the softness of our Woolverino fabric. We apologize that the fit did not meet your expectations. Our goal is always to provide the best possible product for our customers. If you are unsatisfied with your purchase, our return policy allows for easy returns and exchanges. Please don't hesitate to reach out to our customer service team for assistance.

Thank you for choosing Minus33.

-Steven D

T
Tony L.L. (Louisville, US)
Black / XL
Good Stuff

Fit perfectly
Feel great

don't get a light color

Tony,

Thank you for your positive feedback on our Micro Weight Woolverino Men's Wool Brief! We're glad to hear that they fit perfectly and feel great.

Thank you for your continued support of our brand.

-Steven D

R
Robert

Comfortable

Men's Merino Wool Briefs | Woolverino Micro