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For cold winter days and treks through alpine terrain, the Smartwool Men’s Lightweight Bottom is the intelligent way to start your layering system. Made from 100% jersey knit merino wool, this lightweight baselayer wicks moisture and dries quickly while fighting nasty odors during extended forays into the backcountry.

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SmartWool NTS Lightweight Bottom - Men's

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Here's what others have to say...

5 5

love the smartwool

  • Familiarity: I've used it several times
  • Fit: True to size

Was waiting for a sale on these, size L for my 6'1" 200 lb husband. They fit perfectly. Great for a base layer while skiing.

Unanswered Question

I will go to the K2 and I look...

I will go to the K2 and I look for thermal untherwear for -40�C. What item would you recommend?



Best Answer Responded on

Smartwool does not give a temp. rating for there products. Here is how they break it down.
NTS Micro 150g/m2- single layer for warm weather, base layer for cool weather
NTS Light 195g/m2- single layer for cool or cold weather, base layer for cold weather
NTS MID 250g/m2- single layer for cold weather, base layer for very cold weather.

5 5


  • Gender: Male
  • Familiarity: I've used it several times

Really happy with this product, just the right weight. The wool fabric is the perfect natural temp regulator, I may get another pair...

5 5

Very nice, but check your size

  • Gender: Male
  • Familiarity: I've used it several times

I went by the sizing chart and picked up a large. I should have gotten a medium. I'm 6', 175 lbs, 34" waist. Large fits good everywhere and then goes all sorts of baggy around my crotch. I have a fat Sicilian ass too. They are far superior than the Arc'teryx EON SLW Bottom (put a hole in them just putting them on).

5 5

Bought for hiking trip

  • Gender: Male
  • Familiarity: I've used it once or twice and have initial impressions

I bought this for a planned hiking trip in New Zealand (Milford Trek) which spans 33 miles over 5 days. I have only tried this on, but I plan to use these with North Face Paramount Convertible Pants and also TNF Venture Side Zip Pants. These are quite thin; kind of like a pair of "silk" pants I have for skiing. Probably more to keep sweet and water from soaking in, not sure how warm these will be.

4 5

Very soft

  • Gender: Female
  • Familiarity: I've put it through the wringer

I love these despite the fact that they do not look like the photo after about 5 minutes on my legs. Good thing I am not trying to make much of a fashion statement. Icebreaker seemed to have a tighter weave, but did not stretch the 36 inseam I needed for comfort. Smartwool also seems to have done a better job in figuring out how to take the little remaining itch of wool, so they get my pick despite the fact that they get holes much quicker and do not come in as many cute colours. I am tough on my cloths. 170# and long legged, a medium works great! I wish they had an expedition weight. LL Bean makes a nice TALL size that comes pretty darn close! But Smartwool is my pick for overall performance on the trial, curled up at night, and kicking about town in a skirt. Heck, why take them off to shower? I live in my Smartwool!!!

5 5

SmartWool NTS Lightweight Bottoms Rock!

  • Gender: Male
  • Familiarity: I've put it through the wringer

These are my go to long johns for alpine backpack trips. I use them every night, around camp, and in my sleeping bag. Even if I don't need the extra warmth in my bag, the lightweight layer keeps my legs from sticking together after 6 days on the trail! My legs don't get cold when hiking so I don't have experience with these bottoms in a "heat build-up"situation. Recommended.

Note: When worn, my bottoms definitely don't look like those in pic. I've scoured my photo database and can't find a single pic of the real deal!

SmartWool NTS Lightweight Bottoms Rock!
1 5

Quality problem on two consecutive Smartwool bottoms

I purchased two Smartwool merino liners, one from a local shop and another from Backcountry a few days later. The same day the one from Backcountry arrived, I washed the one from my local shop. Followed all instructions and washed on gentle cycle with low heat dryer. The pair came out unraveling at the ankle seams. Exchanged that at the local shop for a second pair which came out of their first washing with a huge rip in the seat (and it wasn't even on the seem). I thus decided to return the unused pair to Backcountry and go with Icebreaker instead. I live in the town of Smartwool's HQ and emailed in my issue but haven't heard anything back in a week. This is quite disappointing to see the "hometown team" have this problem. For now, I'd stay away from this product.

5 5

Smartwool Light Weight Long Underware

These fit great. I wore them all last week and felt better than the Smartwool Mediun Weight I have already. Long enough to shrink but not too long. I bought the blue ones

5 5

Great gear!

I ordered these and a crew, both lightweight. They are perfect for me in north Alabama. Following the size chart's recommendations got me a good fit.

They are so comfortable that I have found myself not wanting to take them off. Amazingly comfortable, much different than the wool I grew up with.

Plenty warmth for my part of the country. I'm hooked.

5 5

Perfect light to mid weight base layer.

I could not be happier with these. They are super soft. Unbelievably comfortable. The seams on other base layers I have worn have bothered me. I don't even notice they are there on these. Warmth wise, well they are a lightweight pair. Although, they are warmer than other lightweight layers I have tried. Perfect for snowboarding or other winter activities during a Utah winter, which is exactly what they are made for. However, not the best for high mountaineering unless you have some other significant layers on.

Responded on

If I were looking into these, would you recommend getting these or the midweight?

I own a heavier pair for winter activities and want the new pair for 3-season backpacking.