How to Choose Base Layers
Smartwool Merino 250 Base Layer Bottoms - Men's
This product is not available. Good news: we have a newer version.
The Smartwool Merino 250 base layer bottoms for men are ideal for stop-and-go activities in cold weather.
Shop newer version- Merino wool helps maintain comfort whether the climate is warm, cold or in-between
- With a UPF 50+ rating, fabric provides excellent protection against harmful ultraviolet rays
- Chafe-free flatlock seams enhance comfort
- Wide, soft waistband enhances fit
- Functional fly, close-to-skin fit and natural rise
- The men's Smartwool Midweight long underwear bottoms do not itch and will not shrink; machine wash and dry
Imported.
View the Smartwool Classic Thermal Merino Product LineView all Smartwool Men's Base Layer Bottoms| Best Use | Multisport |
|---|---|
| Fabric | Merino wool |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50 |
| Moisture Wicking | Yes |
| Fly Opening | Yes |
| Underwear Weight | Midweight |
| 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
41 people found this review helpful
12 years ago
2nd Set
After hearing me rave about my SmartWool long underwear during the last couple of cold Ohio winters, my husband decided to try a set of his own on a fishing trip in March near the shores of Lake Erie. He's a convert now. He couldn't believe how comfortable they are, and they did a great job of keeping him warm in his waders out in the cold water and hiking through the snow. He's a tall, slim guy (6'3" and 160), and the Medium fit him perfectly, and actually came down to his ankles (usually long underwear stop at mid-calf for him). He started wearing them to work when he needed to be in unfinished, cold spaces, and so this was a purchase of a second set.
Yes , I recommend this product
calloddie
Columbus, OH/Seattle, WAMost Helpful Critical Review
126 people found this review helpful
10 years ago
Not what they used to be!
I have purchased three sets (top/bottom) of this product over the years. The bottoms were 'updated' a bit over a year ago to have a wider waistband that is seamed in the front.
First of this 'improved' type bottom was purchased in February, the waistband started to come apart in three months. In July, it completely separated.
REI replaced the failed product in August. It is now December..and the waistband in THAT product is completely separated.
I have an OLDER bottom that is four years old. I've worn it pretty much to tatters...but the WAISTBAND? It is still PERFECT.
SmartWool has the basis of an excellent product. NO OTHER undergarment has performed as well at its job as does this merino wool product. The QUALITY however, has taken a long jump off a big cliff.
I did contact SmartWool about the issue, hoping to help them help themselves. They did not bother with a response of any kind.
REI on the other hand, continues to support their customers. Kudos to REI. Nothing of the sort to SmartWool.
No, I do not recommend this product
Canyn
State of JeffersonZACH
OHIO
Great Warmth - Bad Waist Band
6 years ago
I was skeptical about trying these out because the Nike and Under Armor cold gear makes me feel colder than if I had no base layer. However, these are amazing! I initially bought them as a base layer for skiing, but I wear them everywhere now and under anything. My only compliant is the waist band. I wore them only once before the band creased in the middle. It doesn't detract from the comfort, but it is annoying knowing it's already bent. I've had a Nike pair for 10 years and the waist band is still as good as new. For $100, you'd think they'd figure this out, but even then, they are worth the price in the warmth and comfort they provide.
Yes , I recommend this product
calloddie
Columbus, OH/Seattle, WA
2nd Set
12 years ago
After hearing me rave about my SmartWool long underwear during the last couple of cold Ohio winters, my husband decided to try a set of his own on a fishing trip in March near the shores of Lake Erie. He's a convert now. He couldn't believe how comfortable they are, and they did a great job of keeping him warm in his waders out in the cold water and hiking through the snow. He's a tall, slim guy (6'3" and 160), and the Medium fit him perfectly, and actually came down to his ankles (usually long underwear stop at mid-calf for him). He started wearing them to work when he needed to be in unfinished, cold spaces, and so this was a purchase of a second set.
Yes , I recommend this product
Wallace
Naperville, IL
Extremly comfortable and warm
6 years ago
I bought these at an REI store after first going to try on the 150 version. These are much warmer and work great for me. They are also very soft on the skin and do not get itchy or too warm, along with having no sweat smell after wearing them all day. Another feature I like is how they do not slip down my waist ever and they go all the way down to cover half of my foot and I am 6'1" (bought size XL). I am a forest preserve worker in Illinois and I wear these outdoors 8 hours a day with thin pants over them and I am very warm and comfortable. I sometimes use similar pants made by Under Armour and the Smartwool ones are vastly superior. I plan on buying a few extra pairs.
Yes , I recommend this product
Kaminante
Ashland
Great short-term base layer. Extremely delicate.
5 years ago
I've logged over two months camping and around 15 days of hiking with these pants. Merino wool itself is pure magic. Doesnt smell, insulates great. These pants really help to insulate your lower half with a wind-proof outer layer, and have not let me down. However, even with taking special care in handling and washing these guys (hand washing), after a total of seven months of occassional use, they are permenantly stretched out in the waist/sides and fronts of the upper part of the pant. As well as the very bottoms. This causes a noticible difference in insulation from the stretched fabric and baggyness. My amazon merino wool tights at 1/3 the price are of more or less the same quality, and have not stretched as much in the same amount of time. In fact, they are now overall thicker than these.
Yes , I recommend this product
Canyn
State of Jefferson
Not what they used to be!
10 years ago
I have purchased three sets (top/bottom) of this product over the years. The bottoms were 'updated' a bit over a year ago to have a wider waistband that is seamed in the front. First of this 'improved' type bottom was purchased in February, the waistband started to come apart in three months. In July, it completely separated. REI replaced the failed product in August. It is now December..and the waistband in THAT product is completely separated. I have an OLDER bottom that is four years old. I've worn it pretty much to tatters...but the WAISTBAND? It is still PERFECT. SmartWool has the basis of an excellent product. NO OTHER undergarment has performed as well at its job as does this merino wool product. The QUALITY however, has taken a long jump off a big cliff. I did contact SmartWool about the issue, hoping to help them help themselves. They did not bother with a response of any kind. REI on the other hand, continues to support their customers. Kudos to REI. Nothing of the sort to SmartWool.
No, I do not recommend this product
Rkmears
Madison, WI
Outstanding!
12 years ago
I have owned many different types of base layer before being converted to merino wool and I am not looking back. The top of the pants and leg cuffs are comfortable. The crotch area is gusseted and unrestricted. Absolutely works as advertised!
Yes , I recommend this product
Noxy
Milwaukee, WI
Warm, comfortable, awesome
12 years ago
I've had a set of midweight (top and bottom) long underwear for 2 winters, not counting this one. It's fantastically warm like no cotton can ever feel, it's amazingly soft and comfortable, and it's lasted quite a long time with daily usage in the cooler months. I recommend Smartwool underwear 100%.
Yes , I recommend this product
bocud
Boulder County, CO, United States
warmth and comfort
11 years ago
This was probably a little pricier than I wanted, but it goes to show that you get what you pay for. These long johns were warm, wicked very well, and were totally comfortable.
Yes , I recommend this product
martimbe
Alexandria, VA, United States
Life-changing Long Johns
10 years ago
Boy, have times changed! No more white waffle-knit cotton long johns for me - these SmartWool base layer bottoms have completely transformed my skiing experience! They are super soft, extremely comfortable, and incredibly effective at wicking away moisture and odor! I'm totally hooked and won't wear anything else under my ski pants now! I went to REI in a semi-panic because I waited too long before a major ski trip, and I grabbed these - which turned out to be the last pair of SmartWool base layer bottoms in the store. I wasn't sure whether I needed mid-weight or lightweight, but at that point, I had no choice...and for spring skiing (first week of March) in Telluride, CO, they were perfect. I wondered if I might be too warm, but I was perfectly comfortable from 9:30 a.m. - 3:30 p.m. with temps in the 20s/30s on the mountain and up to 40 at the base. Pretty amazing, really. I never once thought about whether I was too cold or too warm - which was a new experience for me, as I'd always associated skiing with various kinds of physical discomfort. And after three full days in a row, they still smelled fresh at the end of my trip! (Gross to think about it, but it's one of the nice things about merino wool, and I have to confirm that it's true!) Yes, they are very expensive. I couldn't believe what I was going to pay to get them. But after all I'd heard about them, I really wanted to test them out, and I am extremely happy with them. It's an investment, and it pays off handsomely in comfort and function. Highly recommended.
Yes , I recommend this product
Kyle M.
Westminster, CO
So Comfy!!
9 years ago
These are the 260g weight underwear. The bottoms come up to just below the calf muscle, which fine, I have long legs. My long socks fill the gap anyways. Very comfortable, I wear them all the time around the house too. Its been warmer here in Colorado so I haven't been snowboarding in cold cold temps, I am sure they will do better than my last pair (Icebreaker 150g). Woman I get why you love yoga pants and leggings so comfy!!
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