How to Choose Base Layers
Smartwool Microweight Long Underwear Bottoms - Wool - Men's
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Get out there to enjoy your favorite activities in the comfort of the men's Smartwool Microweight long underwear bottoms.
Shop similar products- Fine merino wool helps maintain a comfortable temperature whether the day is hot, cold or in between
- Chafe-free flatlock seams enhance comfort
- Fabric protects skin from harsh UV light with a UPF rating of 30
- Wide waistband enhances fit
- Functional fly
- Unlike traditional wool, Smartwool items do not itch and can be repeatedly washed and dried without shrinking
- The formfitting Smartwool Microweight long underwear bottoms for men offer a minimalist fit and a natural rise
Imported.
View all Smartwool Men's Base Layer Bottoms| Best Use | Multisport |
|---|---|
| Fabric | Merino wool |
| Sun-Protective Fabric | Yes |
| UPF Rating | 30 |
| Moisture Wicking | Yes |
| Underwear Weight | Lightweight |
| Inseam (in.) | 29 inches |
| Gender | Men's |
Smartwool Clothing - Men's
| S | M | L | XL | XXL | |
|---|---|---|---|---|---|
| Chest | 36 - 38 | 39 - 41 | 42 - 44 | 45 - 48 | 49 - 51 |
| Sleeve Length | 31 - 32 | 32 - 33 | 33 - 34 | 34 - 35 | 35 - 36 |
| Waist | 29 - 31 | 32 - 34 | 34 - 37 | 38 - 40 | 41 - 44 |
| Hip | 36 - 38 | 39 - 41 | 42 - 44 | 45 - 48 | 49 - 51 |
| Inseam | 30 - 31 | 31 - 32 | 32 - 33 | 33 - 34 | 34 - 35 |
Sizing Notes
Measurements are stated in inches.
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Most Helpful Favorable Review
Warm and comfortable
IndyBluehen11 years ago
I'm a believer in Merino wool products -- they seem to only get softer with wear and washing. Cotton underwear now seems heavy/scratchy to me by comparison.
I needed a lightweight thermal bottom for a recent backpacking trip to Alaska and was pleased with the microweight fabric. I wouldn't recommend it for below freezing temps, but for cool nights into the 30's, it provided ample warmth. I love SmartWool socks, and this underwear has a similar build quality.
IndyBluehen
Indianapolis, IN
9 people found this review helpful
Most Helpful Critical Review
Amazing product, not durable
Bassbone197510 years ago
I love smartwool. It works amazing. However, the microweight isn't very durable, due to its lack of thickness. I wore it on my last snowshoe of the season last year and discovered that the right thigh was perforated with many tiny holes and tears from where it had apparently failed during the wash. Talk about disappointing. I won't get any merino wool product this thin ever again.
Bassbone1975
Lakewood, WA
15 people found this review helpful
IndyBluehen
Indianapolis, IN
Warm and comfortable
11 years ago
I'm a believer in Merino wool products -- they seem to only get softer with wear and washing. Cotton underwear now seems heavy/scratchy to me by comparison. I needed a lightweight thermal bottom for a recent backpacking trip to Alaska and was pleased with the microweight fabric. I wouldn't recommend it for below freezing temps, but for cool nights into the 30's, it provided ample warmth. I love SmartWool socks, and this underwear has a similar build quality.
Yes , I recommend this product
Tom the chilly mountain man
Warm, but too thin
9 years ago
I wore these on one 9 day elk hunt in the Wyoming mountains and on the 4th day I simply knelt down to start a fire and the right knee tore a large hole about 5" in diameter so the last 5 days I was completely warm except for my freezing kneecap. They worked great otherwise but the material is just too thin to stand up for their intended use. And I was wearing khul pants, which are pretty thick so it wasn't due to abrasion, simply couldn't withstand the stretch of a bending leg. I'll be sending them back for the midweights.
Bassbone1975
Lakewood, WA
Amazing product, not durable
10 years ago
I love smartwool. It works amazing. However, the microweight isn't very durable, due to its lack of thickness. I wore it on my last snowshoe of the season last year and discovered that the right thigh was perforated with many tiny holes and tears from where it had apparently failed during the wash. Talk about disappointing. I won't get any merino wool product this thin ever again.
No, I do not recommend this product
Ghengis Khan
Ulaanbaatar, Mongolia
Only Lasts One Season
9 years ago
The product is super soft and comfortable, perfect for cooler days when you want to be active. But within 2-3 months of regular use they had already developed big holes that were not repairable. At this price point they are simply too expensive for one season use. Going forward I’ll stick with the mid-weights.
Matteo Brown
Spring, Texas
great for cool weather
11 years ago
The Smart Wool microweight merino wool base layer bottoms are great for cooler days (on the Texas Gulf Coast / Piney Woods). They fit true to size
Yes , I recommend this product
legatoistheman
Harrisburg, PA
Keeps me warm at my cold office
9 years ago
These keep me warm at the office and out and about without being too warm. They regulate temperature just right, I am never too warm. Nicely designed and fit really well.
Mitch
Minnesota
PDQ - Poor Darn Quality
5 years ago
Wore out and torn at crotch and knees prematurely. No expectation that they'd last forever but should last more than two winters with light use. Probably not telling SmartWool something they don't already know as they have a new, improved product available now. I am willing to pay a premium price for a premium product but this was not it.
No, I do not recommend this product
TG hiker
Tremont, Illinois
Comfortable
8 years ago
I bought these to hike in colder weather. I also used them on a snow ski trip recently where temps were in single digits. They are extremely comfortable, but did not feel they kept me that warm. Hiking and walking, they fit good, just not the warmth I was hoping for. For the money I spent, a bit disappointed
No, I do not recommend this product
EgorR
Seattle, WA, United States
Almost perfect
8 years ago
I like them a lot, smooth outside, fuzzy inside, good quality but I had to return them because the top was too short in the back. I need pants like this a bid longer there, these felt like front was higher than back although I bought size XL and I usually wear M. Never used them.
Yes , I recommend this product
Grandma Kathy
Sandy Spring Maryland
Grandma Kathy
9 years ago
"Smartwool"is always a great product!! I always shop at REI first for any "Smartwool"I purchase. The customer service, returns and exchanges are always top-notch. If I'm giving a gift I know the gift can be exchanged at REI with the best of service.!!
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