Smartwool Midweight Bottoms - Men's

$66.95 94.95 save up to 29%
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Mid-winter temperatures call for extra warm baselayers to keep you warm whether you’re skiing backcountry trails, snowmobiling into a snow-buried cabin or harvesting icicles from the roof; perfect for cold temps are the Smartwool Midweight Bottoms for men. Made from their heaviest NTS fabric, these long underwear bottoms are 100% merino wool for itch-free softness that is naturally odor-resistant. These tights will wick moisture and breathe, keeping you comfy and regulating your temperature during stop-and-go activities while a covered elastic waistband and flatlock seams eliminate chaffing. Smartwool’s Zque accreditation system lets you trace your pants all the way back to the sheep it came from, ensuring the best environmental, social and economic practices. NTS stands for Next-To-Skin, but the Smartwool Men's Midweight Bottoms will feel as natural as a second skin; should have called them SSS or Sweet-Second-Skin.


  • Form Fit - Natural Rise
  • Interlock knit
  • Covered elastic waistband and traditional fly design
  • Flatlock seam construction is designed to eliminate chafing
  • Size M/Inseam: 29" (74cm)
  • 100% Merino Wool

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Review Summary

5 out of 5

20 Reviews

  • Great design: 6
  • Ease of use: 3
  • Great value: 3
  • Performance: 13

  • Cost: 6
  • Wears quickly: 1
Comfort: 5 / 5
Quality: 4.9 / 5
Warmth: 4 / 5
Fit: 3.2 / 5

20 Ratings & Reviews

Can't go wrong with smartwool!
January 31, 2010

Bought these for my son along with smartwool snowboard socks. He used them snowboarding for the first time last week in single digit, windy conditions. He came back saying both his legs and feet were warm and comfortable. Can't go wrong with smartwool!

Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 4 / 5
from Indy
45-54 yrs

Worth buying
March 30, 2011

I have a couple of pairs from other companies, and think the SmartWool bottoms (and tops) are the best value for the money. The quality is apparent right away, and they are warm and comfortable. Altrec got these to me quickly, and anyone who shops the gear sites online much knows how frustrating it can be dealing with a "fly by the seat of your pants" outfit that ships 5-7 days after you place your order. Nice job, Altrec!

Pros: Performance, Great value

Can't get enough of smartwool.
December 16, 2009

There is nothing like smartwool midweight bottoms in the winter. Well just about anytime. The chill of cold weather is really eliminated by having this extra layer next to the skin. I love it so much, I never want to take it off. I'm addicted! Finally figuring out a lightweight way to stay warm has significantly changed my life for the better.

Comfort: 5 / 5
Quality: 5 / 5
Warmth: 4 / 5
from Corvallis, OR
25-34 yrs

Perfect Lower Base Layer
January 09, 2011

I have not worn these out in extreme conditions, just around town in the lower 30's under jeans and out for runs. Extremely comfortable, not itchy and very odor resistant. After wearing them running as my underwear layer, one would expect them to be a little gamey. Not so, not a bit. I am really developing a strong affection for merino wool, and Smartwool is one of my favorites. Other great brands I've tried so far- I/O Bio and Minus 33. I wish Altrec would start carrying Minus 33 as their pricepoint is a bit lower than I/O and SW. This is a wonderful pant though.

Pros: Great design, Build quality, Performance, Great value, virtually odor free, Cons: Cost
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 4 / 5
Warmth: 4 / 5
from Isle of Long, New York

Itch Free Warmth
February 03, 2012

These can keep you warm without itching. The benefits of merino wool: proper warmth and moisture control. Sizing is good, while I either take a medium or large depending on the cut of the item, these in medium worked fine. Quality seems good, but only have used them a few times, all with good results. Recommended, as you get what you pay for.

Pros: Great design, Build quality, Ease of use, Performance
Comfort: 5 / 5
Quality: 4 / 5
Warmth: 4 / 5
from Herndon, VA
25-34 yrs

Great first/second layer
November 26, 2010

I bought these to run in on the colder days but have ended up wearing them as a general first layer (under pants) whenever I spend anytime outside on colder days. I have learned through previous experience that merino wool does not stink after runs, but I feel overall that the icebreaker products are of higher build quality than smartwool. Something about the weave makes them seem more robust. Note that these have a fly and cannot be worn as an outer layer in most instances.

Pros: Build quality, Performance, Cons: Wears quickly

Smartwool Is The Best!
December 16, 2009

I have purchased various Smartwool products and each has more than met my expectations. I can't believe how comfortable it is, how it holds it shape after many wearings and HOW IT KEEPS ME WARM! I will continue to buy it for myself and to give as gifts. It has withstood many visits to the washing machine and always surprises me how it retains its color. You can't go wrong with SMARTWOOL! You will love it!

Comfort: 5 / 5
Quality: 5 / 5
Warmth: 4 / 5

from southwest usa
45-54 yrs

warm undies
January 21, 2011

Smartwool is simply the best! Comfort, performance, if you wash with woolite they last for years. I have used smartwool for years, great product! Altrec carries great brands and has always come though. Thanks!

Pros: Great design, Build quality, Performance, Great value
Comfort: 5 / 5
Quality: 5 / 5
35-44 yrs

Very Warm and Very Comfortable
December 08, 2010

This is my favorite Base Layer option. They are lightweight yet very warm. They are too warm to ride in but for walking and lounging around the house they are just right.

Pros: Great design, Build quality, Performance, Cons: Cost

the cadillac of long johns. . .
January 02, 2008

warm when cold. cool when warm. great temperature control. super soft to wear. in conclusion, i love them. i wear them everyday.

Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 4 / 5

from Independence, MO
25-34 yrs

January 12, 2011

Expensive yet hopefully worth it in the long run. Ive used these along with the top while on shift at the fire dept and they work great. Warm and comfy. Unsure about durability.

Pros: Performance, Cons: Cost
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 3 / 5
from smoky mts
45-54 yrs

Best Available
January 07, 2011

although pricy, smartwool undergarments and socks are among the best performing outdoor acessories around. they will soften abit after a few wearings/washings. Great breathability and dont collect odor like polys.

Pros: Great design, Build quality, Performance, Ease of use, Cons: Cost

Warm and keep your sweat out.
May 28, 2010

Smartwood has amazing quality to take the sweat out and yet keeps you super warm. It is like a thermostat keeps your temperature at steady warm temperature. Highly recommended!

Comfort: 5 / 5
Quality: 5 / 5
Warmth: 4 / 5

55-64 yrs

Smartwool is the Smartest Choice in mid Layer
October 30, 2010

Without question the best under-layer i have purchased. I waited out last year working with my well-worn poly railing against the price of mid-weight smartwool.... It was a mistake I don't intend to repeat. Simply the best in every respect. Extremely comfortable, warm when it should be, easy care, excellent fit. Odors don't easily attach or cling to smartwool thankfully. Easy field wash and dry as well. I'm a pro woldlife photographer spends a lot of time outdoors in virtually every climate as you might expect. I don't know that I will be taking this with me to tropical climes (unless at altitude) but I can easily envision them being a staple pack list item. If/when these wear out or a bear takes a chunk out of my butt I'd replace them with the same item in a heartbeat (assuming, again, that there was enough of my butt left). I purchased XL for tops and bottoms. I am 6'3, 207 Lbs. 36" sleeves, 34 inseam and a 40" waist. These were the right sizes. I wish they were cheaper but won't care in February in Alaska. In the final analysis I'd bet I will be considering this purchase a bargain. I like the zip-T feature rather than the crew-neck. Personal preference there. No itch. No regrets.

Pros: Great design, Build quality, Performance, Ease of use, comfort, Cons: Cost
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 5 / 5

February 12, 2011

Merino wool is always my choice for woolen wear in the winter. Very warm and very comfortable under outer layers. SmartWool products are well made. I use these under pants for timber cruising at temps of 0-30F when there is no snow.

Pros: Build quality, Performance

Worth the money
December 25, 2009

It is light and comfortable, and the most important thing is: it is warm!

Very comfortable
February 16, 2010

These bottoms have a nice soft feel that is very comfortable. They also seemed to wash up well for me.

Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 4 / 5
from MI
35-44 yrs

Happy Legs
March 05, 2011

skied three days in these in a variety of conditions from bitter cold nights to nice sunny days. My legs were perfectly comfortable regardless of conditions. This wool feels better than cotton on your skin, because it is just as soft but never heavy.

Pros: Build quality, Performance
Comfort: 5 / 5
Quality: 5 / 5
Warmth: 5 / 5
from CT
25-34 yrs

Comfortable? Yes.
November 03, 2010

Was skeptical of any wool underwear being "itch free," but after trying them on, i hardly notice them, except that I have been very warm. Quality item!

Pros: Build quality, Performance
Comfort: 5 / 5
Quality: 5 / 5
Warmth: 3 / 5
from Edinburg, VA
35-44 yrs

Love these
February 01, 2012

I wear these hunting and also for hiking in cold weather. They fit snug but not tight. The wool does keep body odor to a minimum even after a full day of hiking. They dry rapidly and also function well as an base layer. I also own the matching top and they are also a valuable asset in my outdoor wardrobe. I am 6'1" and weigh 210 and have both in size large and they fit well...snug but not super tight.

Pros: Build quality, Performance, Cons: Cost

Also Available

Smartwool Men's Midweight Bottoms Photo

Black, Graphite and Olive Heather.

Available sizes, while supplies last, include size small, size medium, size large, size extra large and size extra extra large: s, m, l, xl, xxl.

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