Smartwool Microweight Bottoms - Men's


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Ultra soft and comfortable against your skin, the Men's Smartwool Microweight Bottoms are hard to beat. For high performance in the heat, these Merino Wool tights help regulate temperature by pulling sweat out so your legs can breathe, keeping you dry and cool during physically demanding activities. Also great as a cool-weather baselayer for winter activities, these wool bottoms will work with you on the slopes or in the backcountry to keep your legs warm and charging hard.


  • Fabric: 100% Merino wool
  • Fabric: Jersey knit
  • Ultraviolet Protection Factor (UPF): 30
  • Fully functional fly with contrast color bar tacks at fly opening and internal stitching detail
  • Coats Eloflex® thread at bottom hem openings for increased durability
  • Flatlock seam construction eliminates chafing
  • Smooth embossed logo elastic waistband
  • Natural rise
  • Form fit
  • Inseam (size m): 29 in, 74cm
  • Fabric weight: 150 gm per sq m, 4.5 oz per sq yd
  • Weight: 160 g, 5.64 oz

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Review Summary

5 out of 5

23 Reviews

  • Great design: 7
  • Great value: 6
  • Ease of use: 4
  • Build quality: 12

  • Cost: 6
  • pricey but you get what you pay for.: 1
  • Wears quickly: 1
Comfort: 4.8 / 5
Quality: 4.8 / 5
Warmth: 3.4 / 5
Fit: 3.2 / 5

23 Ratings & Reviews

Comfort: 5 / 5
Quality: 5 / 5
from Boston, MA
35-44 yrs

Just what I was looking for
February 01, 2011

I must admit to being a big fan of every Smartwool product that I've purchased. These are no different. I wanted something to keep me warm when I am outside but that I would not make me too hot when I am inside. These aren't gonna keep you warm if you are out all day but if you are going in and out then they are perfect. They fit great (size M - 5'11", 155), have some stretch in them so they can adapt to different body types.

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

Smartwool is the best!
December 08, 2010

Merino wool is superior to synthetic fabrics. Oz for oz, I think Smartwool offers better insulation. Smartwool is not like wool that I remember as a kid either. No itchiness. Also Smartwool really does not hold odor like much of the synthetic outdoor clothing I have. The quality of Smartwool products is the one to beat for sure. If you want the best, treat yourself to Smartwool. Seriously. Give it a try. You won't regret it if you are serious about quality outdoor clothing.

Pros: Great design, Build quality, Performance, Ease of use, Cons: Cost
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 4 / 5
from Chicago, IL
25-34 yrs

Great Base Layer
December 29, 2010

I bought these base layer bottoms a year ago and I am still amazed at how well they perform. I wear them under my dress pants to work as I am often times outside during at my job the winter. Size is true to fit and extremely comfortable. Long lasting and high quality. I would absolutely recommend these to anyone spending any significant amount of time outside on cold days.

Pros: Build quality, Lasts forever, Performance, Great value
Comfort: 5 / 5
Quality: 4 / 5
Warmth: 2 / 5

November 12, 2011

It does the work it's designed for. A little bit thin. Quick drying. Fit very well. 180cm 90kg size L. I noticed it wear out a little bit quick than I expected. Worth buying.

Pros: Performance, Cons: Wears quickly
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 3 / 5
from Louisiana
55-64 yrs

Men's Microweight bottoms
March 28, 2011

My husband loves these Microweight bottoms and asked me where they had been all his life. Loves Them! They keep him warm in a cold office.IT's important to stay warm at work so you can function at 100%.

Pros: Ease of use, Great value
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5

Light, soft, very warm
November 02, 2010

I have used the Smartwool NTS Microweight bottoms almost every day for about two weeks now. They are incredibly light and comfortable, they are soft and do not itch. For running and hiking these are great, since they have very good mobility, not hampering movement and wick away any moisture with ease. I'm 5'11 and the medium fits me well. I would highly recommend these.

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

December 22, 2010

I have used several brands of bottoms and these definitely are the best I have had. They are very comfortable, breathable and VERY warm. That about all you need for bottoms.

Pros: Build quality, Performance, Cons: Cost

Love Them!!
January 06, 2009

Very comfy! I was worried they might itch being wool, but they're really nice and not too heavy.

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

Great indoor/outdoor option
February 26, 2011

Nice and thin so these bottoms fit easily under your trousers. Solid for 40-50 degree weather when you want to take the chill off outdoors but still be comfortable inside. Wool rules.

Pros: Great design, Build quality, Cons: Cost

Smartwool is the way to go
January 22, 2010

Wore these on a warm ski day at Beaver Creek last week... They are very comfortable and great at moisture wicking. Probably not thick enough for really really cold days, but perfect when a light base layer will do.

Highly recommended
June 07, 2010

My husband wore these almost every day last winter. We live in N.E. and he wore them as an extra layer under his jeans. They were not itchy and easy to care for. Only negative is the seat of the pants started to wear thin. That's why I ordered another pair.

excellent bottom
January 14, 2010

I bought them for my husband and he loves them very much. They are light, warm, comfy and not itchy at all. And they are easy to wash/dry/care. They are good for travel too because they are super-compact!

Comfort: 5 / 5
Quality: 5 / 5
from Allentown PA
45-54 yrs

great liner tights
February 17, 2011

These worked well as a liner tight with insulated Sugoi cycling pants. Rode in 20 degrees and was fine. Much softer on the skin than UnderArmour. Great fly feature.

Pros: Great design, Build quality, Great value
Comfort: 5 / 5
Quality: 4 / 5
FitClothes: 4 / 5
Warmth: 3 / 5
from PDX, OR
25-34 yrs

Spendy, but worth it
March 07, 2011

I was considering silks as I've already got an shirt that I like very much, but glad that I settled on the Smartwool for bottoms. They hold position better than silk, are warmer, and actually just as soft. They're warm enough under jeans for biking in the Northwest winter, but not enough for something static like fishing on the Columbia. Brrrr. I'm 6'1", 180lbs and the large fit a little big on me. I might get a medium next time.

Pros: Great design, Build quality, Performance, Ease of use, Great value, Cons: Cost
Comfort: 5 / 5
Quality: 4 / 5

Smartwool midweight bottomes
February 21, 2011

This product has been terrific for winter hikes or even winter chores . They are very lightweight but deliver warmth without condensation. You forgot that you are wearing long underwear . Far superior to synthetic products - worth the extra expense. Highly recommend to have at least one pair .

Pros: Build quality, Performance, Cons: Cost
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 4 / 5

wonderful product
December 05, 2010

Smartwool products are top of the line. Superb: Great fit. great quality. The customer service/order people are courteous, knowledgeable and efficient. Altrec's prices and service are excellent. It is a pleasure to deal with such a fine company.

Pros: Build quality, Great value

excellent product
December 03, 2009

"These tights are light, warm, silky smooth. In spite of being wool they don't itch *at all*. I'm 5'11" and they fit just fine, and would still if I were a few inches taller. I think I've slept in them every night since I got them about two weeks ago. I'm about to travel overseas and plan to take them along, since they fold up so tiny. They've even prompted a couple of admiring remarks from the wife, so what's not to like?" but

Comfort: 5 / 5
Quality: 5 / 5
from denver, colorado
45-54 yrs

smart wool micro weight
May 31, 2011

Very good product, light weight and warm w comfort fit not too tight or loose. look forward to wearing at altitude and for sleeping while camping. Large size fits at 6'2" 200lbs.

Pros: Great design, Build quality, Cons: Cost
Comfort: 5 / 5
Quality: 5 / 5
FitClothes: 3 / 5
Warmth: 3 / 5
from connecticut
25-34 yrs

January 19, 2011

in the winter i always wear a baselayer... anything from thermal underwear to spandex jogging tights. the smartwool microweight bottoms have been absolutely outstanding. first off, smartwool products, in my experience have been of fantastic quality... in fact, most of my socks these days are smartwool and they have all outlasted any of my other synthetic socks by a decent margin. secondly, the lightweight of these bottoms makes wearing a 2nd layer much less constricting. i don't wear baggy pants so it's important that the base layer not be too bulky. these bottoms are quite thin. they aren't the warmest bottoms i've ever worn but i live in connecticut where winter temps are generally in the 20's and 30's so they are perfect. i've been wearing these basically daily since i've gotten them and can't be more pleased with them. the only gripe i have with them is the waist seems to be a little high on them... but that seems to be the case with most pants out there... just my opinion, though.

Pros: Build quality, Performance
Comfort: 5 / 5
Quality: 5 / 5

Does the job!
April 13, 2011

Good for that extra something you need when out in rain and wind in the 40's. It is surprisingly comfortable. I thought that it would be itchy, but it is not. Very tight fit, but not constricting.

Pros: Build quality, Performance, Ease of use
Comfort: 4 / 5
Quality: 5 / 5

Great baselayer!
January 20, 2011

I used to dread the long winter walk from my truck to the building where I work; the wind cutting through by dress pants and putting me in a sour mood before I even reach my desk. No more. I love these things. They were slightly itchy at first but now I'm used to them, and it seems like I'm wearing a pair all the time (in the winter at least). I've yet to use them for any more 'active' endeavors, but I plan on testing them out in winter running, biking, snowboarding, etc. I expect them to perform wonderfully. If not, I'll simply upgrade to a higher gram-weight version of these SmartWool bottoms. I'm well pleased with these bottoms and would highly recommend them.

Pros: Great design, Performance, Great value

Perfect for a little chill protection
December 03, 2009

comfortable, adding just a little warmth to make lightweight pants suitable for chillier days. the cuffs are stretchy enough that it's easy to keep these above boots, so it's not necessary to get boot-top bottoms in this weight.

February 02, 2010

I love Patagonia but Synchilla long johns of all weights pull the hairs out of my legs. One at a time. Painfully. I don't know why, lucky I guess. But I've heard the same complaint from other men. Usually I just suffer, but this year I received SmartWool midweights for Christmas. They were smooth and painless and warm, but not too warm. Not groin-drenchingly warm. Perfect for working outside in the frigid. For those milder days, and for the inside/outside jobs, I ordered these microweights. They are so darn smoove. That is slang for deadly smooth. And not as silly expenseive as the Patagonia or the Filson wools. It's a compromise. I have little kids, so I know all about compromise.

Also Available

Smartwool Men's Microweight Bottoms Photo

Alloy, Black and Silver Gray 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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