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Smartwool Men's Classic Thermal Merino Base Layer Bottom

  • Based on 639 reviews
Condition: New
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Availability: Only 7 left in stock, order soon!
Fulfilled by SportsNetStore

Arrives Wednesday, Oct 28
Order within 12 hours and 9 minutes
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Size: Medium


Color: Black


Features

  • 100% Merino Wool
  • Made in the USA
  • COLD WEATHER BASE LAYER. Keep your ski or hiking boots free of bulk and friction with our 3/4 Bottom. Merino wool provides ultimate comfort, while a newly redesigned base layer pants fit helps reduce sag and excess fabricperfect for layering.
  • SLIM FIT. Designed to meet the demands of outdoor adventuring, these slim fit bottoms show off a slimming silhouette while offering unrestricted movement through the legs. Inseam: 21.5"
  • CLASSIC THERMAL MERINO. Ideal for cold-weather activities where warmth and breathability are crucial, this midweight fabric used a Merino wool construction that helps move moisture away from skin to keep you warm and dry.
  • FUNCTIONAL FEATURES. Go far, feel good with thoughtful tech to keep you trekking comfortably interlock knitting enhances breathability, thermoregulation and moisture-wicking while flatlock seams minimize chafing for greater comfort.
  • GO FAR. FEEL GOOD. From wool socks to base layers for men, women and kids, we aim to provide the highest quality apparel for your outdoor adventures with a commitment to environmental sustainability, racial equity and inclusivity.

Description

Thermal Base Layer Bottom Thermal Base Layer Crew Active Boxer Brief Boxed Active Brief Boxed

Color: Black


Style Name: Merino 250 Base Layer Bottoms


Rise Style: High Rise


Leg Style: Slim


Fit Type: Slim


Apparel Occasion and Lifestyle: outdoor adventure


Pattern Style: Solid


Pants Form Type: Leggings


Sport Type: Multi-Sport


Apparel Closure Type: Snap


Front Pleat Type: Flat Front


Apparel Closure Orientation: Front


Pattern: Solid


Occasion Type: hiking


character: Sports


Item Length Description: Ankle Length


Inseam Length: 21.5 inches


Waist Size: 33 inches


Garment Size Country: Vietnam


Material Type: Wool


Fabric Type: 100% Merino Wool


Product Care Instructions: Machine Wash


Fabric Stretchability: Stretchable


Apparel Fabric Weight Class: Medium Weight


Apparel Fabric Stretch: Low Stretch


Weave Type: Plain


Brand Name: Smartwool


Age Range Description: Adult


Model Name: Merino 250 Base Layer Bottoms


Style Number: Smartwool


Team Name: Smartwool


UPC: 193392652664


Import Designation: Made in the USA


Global Trade Identification Number: 64


Unit Count: 1 Count


Number of Items: 1


Item Type Name: Men's Merino 250 Baselayer Bottom


Item Weight: 9.28 ounces


Manufacturer: Smartwool


Manufacturer Part Number: SW016361001-M


Number Of Pockets: 5


Fit to Size Sentiment: Positive


Lining Description: 100% Merino wool


Sleeve Length Description: 3/4 Sleeve


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 28

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews


  • Good quality
Size: X-Large Color: Black
Good quality and comfortable it keeps me warm in the cold days specially I work outdoors. A bit pricy but I think it’s worth it.
Reviewed in the United States on January 3, 2026 by Adam

  • The feel and warmth
Size: Medium Color: Charcoal Heather
It was a gift. He loved them
Reviewed in the United States on February 21, 2026 by Rita Whitmire

  • Nice product
Size: Large Color: Winter Moss Heather
Nice and warm replace my Uder Armor with thesed
Reviewed in the United States on February 8, 2026 by Thomas

  • Perfect
Size: X-Large Color: Black
Perfect love them
Reviewed in the United States on April 27, 2026 by The Average Citizen

  • Do the job
Size: Medium Color: Charcoal Heather
Work great for outdoor work in very cold temperatures. They are holding up well after many wearing and washings. Would buy again.
Reviewed in the United States on April 17, 2026 by Sunny

  • Get them, but take extra care!
Size: Large Color: Charcoal Heather
Love them and wanted them for quite some time! Could never justify the price, until winter hunting season. I like how thin, flexible, and warm they are. After my first wash (on cold & delicate) I noticed several holes along the outside leg. This was quite a let down given the wait and price.. I cannot say if I rubbed up against something, & if I did, they were used as an under layer. So not too sure what happened. I could see myself getting another pair as I love pretty much all smartwool products. The warmth and comfort are top notch. ... show more
Reviewed in the United States on March 31, 2026 by JJ

  • soooo good soooo warm
Size: X-Small Color: Black
i've tried base layers from patagonia, arc'teryx, icebreaker. none of them are as warm or as comfortable as the smartwool. very happy to find XS stock on amazon as it is not available anywhere else.
Reviewed in the United States on February 8, 2026 by Tom

  • So far, so great!
Size: Large Color: Winter Moss Heather
I wear these for fishing in cold weather. So far, I have worn once with waders and twice when shore fishing in 38 degrees with strong wind. What a difference! I'm hoping they are durable, as well, and time will tell whether they are ultimately worth the price (admittedly not cheap). They passed the threshold test, however, with flying colors! ... show more
Reviewed in the United States on January 6, 2025 by LawDawg

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