Three pairs of men&
Woolverino Men&
Microweight merino wool boxer briefs for summer any all season - breathable & wicking
100% merino wool boxer briefs. Lightweight all season wool underwear, front close-up

Microweight 145 Men's Boxer Brief 3-Pack Woolverino

Regular price $134.97 Sale price$121.49 Save $13.48
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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: 22 (85%)
  • 4 stars: 2 (8%)
  • 3 stars: 1 (4%)
  • 2 stars: 1 (4%)
  • 1 star: 0 (0%)
Some of the reviews shown are from the products included in this bundle.
A
Anonymous (Montreal, CA)
Black / L
Primary Activity: Casual / Lifestyle
Inconsistent size

Runs extremely small, ordered a large but it fits like a tight medium everywhere that matters, and I can't even explain why it would be this bad because the microweight 145 briefs in large are perfect.

A
Anonymous (Miami, US)
Height: 5. 8
Weight: 185
Primary Activity: Casual / Lifestyle
So comfortable and lightweight

So comfortable and lightweight. Excellent choice.

Good morning Dennis,

Thank you for taking the time to leave a review for our Microweight Men's Wool Boxer Briefs Woolverino. We are thrilled to hear that you are enjoying the cool and comfortable benefits of our merino wool underwear. We are glad that you took the leap and purchased them and we appreciate your loyalty to our brand. We hope to continue providing you with high-quality products in the future. Have a wonderful day!

Linda
Minus33 Customer Service Team

A
Anonymous (Winter Garden, US)
Black / L
All I ever wear

All I ever wear. Extremely comfortable and durable.

Good morning Jeffrey,

We're delighted to hear that you love our Microweight Men's Wool Boxer Briefs! We strive to provide the best quality products for our customers. Thank you for choosing Woolverino!

Linda
Minus33 Customer Service Team

L
Lance

My favorite for hiking.

We're delighted to hear that you love our Microweight Men's Wool Boxer Briefs! We strive to provide the best quality products for our customers. Thank you for choosing Woolverino! Happy Trails!!!

Linda
Minus33 Customer Service Team

A
Anonymous (Macon, US)
Height: 6’0”
Weight: 165
Primary Activity: Casual / Lifestyle
Lack smell

Bought these for wool qualities, particularly the claimed lack of odor. Have only had a week but put them to the test. I wear natural fabric briefs only once and wash due to odor. I just wore these for a full workweek and only now are they exhibiting faint smells. So it’s true. The fit has been perfect so now I only have to see how long they last…

J
Jacob Prescott (North Conway, US)
Navy / L
Height: 5’11
Weight: 180
Primary Activity: Biking
The Ultimate Performance & Comfort

Unrivaled in undergarments. These will keep you warm, cool, dry, and comfortable in both hot and cold weather. I wear these for cross country biking. I have biked 1755 miles this year with over 60,000 ft in elevation gain and I only wear Minus 33 Merino boxers. The best base layer for 100+ kilometer rides.

Wow—thank you for the incredible review! We’re honored to hear our Merino boxers have been with you for so many miles and climbs. It’s great to know they’re keeping you comfortable through all your rides, no matter the distance or conditions. Here’s to many more kilometers in the saddle! ‍♂️

A
Anonymous (Minneapolis, US)
Ash Gray / L
Height: 5'10"
Weight: 200
Primary Activity: Workwear
Wool cool

Thought long and hard about buying these wool underwear. I have tops and love them so I bought two pair of bottoms and they are very cool in 90 plus heat very comfortable, no bunching or climbing or sticking. Don't wait any longer to buy your self a pair or two. I will be adding more in the future. The waistband is soft.

Thank you for taking the time to leave a review for our Microweight Men's Wool Boxer Briefs Woolverino. We are thrilled to hear that you are enjoying the cool and comfortable benefits of our merino wool underwear, especially in hot temperatures. We are glad that you took the leap and purchased them and we appreciate your loyalty to our brand. We hope to continue providing you with high-quality products in the future. Happy adventuring!

Best,

The Minus33 Team

M
Mark

Bought them for bikepacking

A
Anonymous (Yorkville, US)
Black / S
Primary Activity: Running
The Perfect Base Layer

These briefs were a perfect base layer for a road race on a hot day. Super soft and comfortable. Excellent moisture wicking and zero chafing. This is the best of all the wool brands I've tried over 20+ years.

Thank you for taking the time to leave such a positive review for our Microweight Wool Boxer Briefs. We are thrilled to hear that they were the perfect base layer for your road race, providing a comfortable and moisture-wicking experience. Our team takes great pride in creating top-quality products and we are happy to know that we have exceeded your expectations. Thank you for choosing us and we hope to continue providing you with exceptional products in the future.

A
Anonymous (New York, US)
Black / XL
Height: 6'4"
Weight: 230
Husband loves the fit and feel of these briefs

Husband loves the fit and feel of these briefs.

We're delighted to hear that your husband loves the fit and feel of our Microweight Men's Wool Boxer Briefs! We strive to provide the best quality products for our customers. Thank you for choosing Woolverino!

J
Joshua Sparks (Portland, US)
Olive Drab Green / L
Height: 5’10”
Weight: 205
Primary Activity: Casual / Lifestyle
Great product but they are a bit too long

Great product but they are a bit too long. I want lightweight wool to wear in summer. The waist is just right but if I pull them up to be snug they go ever my belly button and are still not far above my knees. I roll the waist band down a few times so it’s actually around my waist

Thank you so much for your feedback! We're really glad to hear the waist fits well and that you’re enjoying the product overall. It sounds like the length wasn’t quite what you were expecting, especially for summer wear. Rolling the waistband down is a clever solution, but we understand that a better fit off the rack would be ideal.

We truly appreciate you sharing your experience—it helps us continue to improve our designs. We’ll be sure to pass this along to our product team for consideration in future updates. If there's anything else we can help with or if you'd like assistance finding a style that might suit your needs better, feel free to reach out anytime!
Sierra S
Minus33

W
Wallace (Middlebury (village), US)
Black / L
Feels great

I bought these for my husband as a gift as he is trying to slowly shift over to clothes made of natural fibers. He loves them so far. Says the fit is great and doesn’t make him feel too hot or sweaty. He is very active so we’ll see about wear and tear as time goes on.

Hi Wallace! Thank you for taking the time to leave a review. We're so glad to hear that your husband is enjoying our Microweight Wool Boxer Briefs. It's great to know that he finds the fit comfortable and that they don't make him feel too hot or sweaty. We hope that they continue to meet his needs as he stays active. Thank you again for choosing our Woolverino products. Stay Cool!
Kindly,
~Sue
Minus33

K
Kim B (Harrisonburg, US)
The best!

Bought these for my husband who was constantly searching for boxer briefs that didn’t ride up and he loves these! He wears them in the office, hiking, and hunting and always chooses these over everything else in his underwear drawer. These wash well and keep their shape. Will be buying more!

Kim,

Thank you for taking the time to leave such a positive review! We are thrilled to hear that our Woolverino Micro Weight Boxer Briefs have become a staple in your husband's wardrobe for both everyday wear and outdoor activities. Our team takes pride in creating high-quality products that are both comfortable and durable. We appreciate your support and look forward to providing you with more of our Woolverino products in the future.

Best,

-Steven D

J
Jonathan

Best boxers ever! These are all I wear.

N
Nick

Loved them

A
Al Rudnitsky Rudnitsky (West Springfield, US)
Navy / L
Best Ever

I have been wearing underwear for a long time. Trust me. These are the best underwear I have ever owned. If I could afford it, I'd replace ALL my existing underwear with the micro weight wool boxers.

Al,

We are thrilled to hear that you're enjoying our Micro Weight Woolverino Men's Wool Boxer Briefs! We take great pride in providing high-quality products, and we are honored to have your vote for the best underwear you have ever owned.

We completely understand the desire to replace all your existing underwear with our Woolverino boxers. While we cannot promise anything, we do have sales and promotions throughout the year that may make it more affordable for you to do so. Please keep an eye out for future deals, and thank you for choosing our brand.

Wishing you comfort and satisfaction always.

-Steven D

D
Dillon Poole (Colorado Springs, US)
Very comfortable, but didn't last long

Love the fit and the length, especially in the winter months. Like other wool products, they don't stink when out in the field for days on end and can be cleaned and dried relatively quickly.

That said, my oldest pair are almost 2 years old and have worn completely through along the bottom seam. I thought the fabric blend would make them last longer. I don't think anybody has figured out how to make wool underwear that lasts, which is a bit disappointing for the price, but not unique to Minus33.

P
Pasquale

Excellent!

J
Jeff Pralle
Best Backcountry & Everyday Undies

Hands down the best underwear I have ever owned. I bought them for hunting season and now they are the only ones in my drawer!

Thanks for the great review. We're glad the Woolverino Men's Wool Boxer Briefs - Micro Weight are a staple for you!
-Katie P.

G
Gavin

Great huggers.

M
Mark McGuire (Prior Lake, US)
ALL SEASON COMFORT

I live in Minnesota, winters are cold and long. Summers are hot and moist. Since I discovered these boxer briefs a few years ago, they have been my GO TO undergarments for all seasons. I have tried other merino underwear (Icebreaker, Duckworth, Smartwool) and these are by far the most durable and comfortable. 5 stars all day long.

Mark,

We are happy to hear that our Minus33 boxer briefs are your 'go to' undergarment for all seasons. Thank you for this awsome review!

-Melinda W.

K
Kelly Nichols (Parker, US)
Soft and roomy

I just got these in and they are just as soft as the 100% wool but more roomy. I'm a fan!

Kelly,

We are happy to hear that you're enjoying your Minus33 Woolverino Boxer Briefs! The Woolverino line has some of my personal favorite items included in it and I agree that they are just as soft as our 100% wool items as well!

-Steven D

M
MMC (Kaysville, US)
Merino Boxer Briefs

I gave these boxers a three star review, because of the fit. However, take it with a grain of salt, as I’m a weird body type. I’m a bit on the short and stout side, so it’s very rare that anything fits me properly. I followed the sizing chart on the site, but found them high very high waisted and saggy around the butt area, which would likely cause chafing during a long run or multi-day backpacking trip. I got them because I read a review that said they helped prevent thigh chafing (the short/squat man’s nemesis). This part held true. Though I had some annoying fabric bunching up around my butt, the leg portion stayed in place and kept my thighs from chafing.
Since they are underwear, and I assumed not returnable, I treated them pretty rough, right out of the box. I washed and dried them on high heat several times and they didn’t shrink or fall apart. I wore them for multiple days for hikes and runs and they held up just fine. My wife didn’t complain about my funk, so the merino wool anti microbial quality is pretty good too.

Overall, they’re a decent product, just be sure about your body type. I also have a lot of other Minus 33 products that have lasted for years and they’re really good products. It was just a bit of a bummer to spend 4 times more cash than I have ever spent on underwear to find that I can’t really wear it.

J
Joshua Woods (Yuma, US)
Great for hunting

I bought two pair for September elk hunting when it's hot. All the great merino-isms (don't smell, comfy, etc) but have been more resilient than standard merino boxers regarding wear and tear.

Microweight Men's Wool Boxer Briefs 3-Pack