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Smartwool Classic All-Season Merino Base Layer Bottom for Men Black Large

SKU: SMTCABBKL MFR: SW0169580011 L
$90.00

Key Features

  • Experience all-day comfort with these Smartwool merino wool base layer bottoms.
  • Stay warm and dry with our moisture-wicking men's base layer during any activity.
  • Enjoy a full range of motion thanks to the slim fit and flexible design of these bottoms.
  • Perfect for layering, these all-season base layer bottoms regulate temperature effectively.
  • Crafted with durable merino wool and nylon, these bottoms are built to last for years.
  • Wear these lightweight base layer bottoms for hiking, skiing, or everyday warmth.
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Q&A

Questions & Answers

Shopper : are these 250 gsm?Sunny S : This item is made with 88% Merino Wool and 12% Nylon, however it does not specifically mention the GSM. You may reach out to the manufacturer directly for more information.
Shopper : is there no medium?Sunny S : The only available size we are selling now is X-Large

Reviews about this item

Review Summary

2025-05-31T20:00:00

Rated 5 out of 5

Wonderful feel

If you have an issue with a rash when you wear polyester long johns just try these. Amazing feel and no rash.

Charles

2025-05-25T20:00:00

Rated 5 out of 5

Love the quality and fit.

Perfect weight.

colleen

2025-05-22T20:00:00

Rated 5 out of 5

L.O.V.E. it

I have been wearing 'performance' base layers for years. I have not been impressed...until this. Boundary Waters canoe trip in May. I slept in my base layer, got out of my hammock, paddled and fished all day. Total comfort!

Greg

2025-04-09T20:00:00

Rated 5 out of 5

I love them

Great! So comfy!

Chris

2025-03-30T20:00:00

Rated 5 out of 5

Super comfy and warm

I order these for my husband who owns a food truck and is outside, in the mountains, everyday. He LOVES them under his Chef pants.

Penny

2025-03-23T20:00:00

Rated 3 out of 5

10/10 recommend

Always love smartwool base layers. I use them for camping and always stay warm.

Katie

2025-03-15T20:00:00

Rated 5 out of 5

Great base layer.

Great base layer for casual cool weather activity. Has a comfortable waistband and appropriate leg length.

David

2025-03-09T20:00:00

Rated 5 out of 5

I will continue to purchase Smart Wool products

I only use Smartwool base layers. They are the best

Robert

2025-02-23T19:00:00

Rated 5 out of 5

Love this!

Always the BEST in base layers and socks (and everything else!)

Steven

2025-02-16T19:00:00

Rated 5 out of 5

My 2nd pair!

These base layer bottoms are my go-to for cold day runs here in Maine (sub 15F). They are totally comfortable and keep my legs warm underneath my running tights. I also put em on at night at home: nothing better to lay around in on these long winter nights.

Greg

2025-02-16T19:00:00

Rated 5 out of 5

So soft and comfortable.

Bought these to replace some polyester bottoms I've had for a while...these are softer and much more comfortable. I expect have them for years. I'm 5-10 and weigh 165...great fit.

nick

2025-02-12T19:00:00

Rated 5 out of 5

I actually do want to buy more pairs of these

I haven't worn them for activity yet, but they feel great when I try them on. I feel like they'll make a great addition to my camping gear. Thank you!

Thom

2025-02-11T19:00:00

Rated 3 out of 5

I will probably not buy these again.

They're alright, but they wear out too quickly and are too expensive

Liam

2025-02-09T19:00:00

Rated 5 out of 5

Smartwool. Smart buy!

Just wore them for the first time in 20 degree weather downhill and backcountry skiing in New Hampshire and they are fantastic! Warm, breathable, and comfy!

Alan

2025-02-07T19:00:00

Rated 5 out of 5

Big fan of Smartwool

Super comfortable and warm. I have been using the all weather bottoms and two different weights of the 1/4 zip tops for years now and have no complaints.

Thomas

2025-02-05T19:00:00

Rated 5 out of 5

A true timeless classic for winter

All time favorite layering piece for cold weather.

Hazel

2025-02-05T19:00:00

Rated 5 out of 5

Warm and soft!

Excellent comfort and warmth!

Matthew

2025-02-01T19:00:00

Rated 5 out of 5

Never overheat

All day wear

Devin

2025-01-31T19:00:00

Rated 5 out of 5

Already Bought a Second Pair

These pants are a game changer. I'm out in the cold a lot for work, and nothing has been keeping me warm?until these! They're thin enough to wear under other pants, and they keep me so warm. I absolutely love them!

Kristin

2025-01-30T19:00:00

Rated 5 out of 5

Finally

So comfortable and felt great in the freezing cold.

Scott

2025-01-22T19:00:00

Rated 5 out of 5

I would buy this product again and again

Great product. Warm, comfy, quick drying. I will buy Smartwool base layers forever

TYLER

2025-01-09T19:00:00

Rated 5 out of 5

Would absolutely purchase again

Live in Michigan so weather is cold in winter, work outside and inside so I needed a base layer that was warm enough and at same time wouldn't overheat when indoors ! Great product soft and fits perfectly.

Joel

2025-01-06T19:00:00

Rated 5 out of 5

Definitely will purchase these again.

This base layer is great for being out in the field doing trail work especially during cold and wet days. The bottoms are comfortable and give me just right amount of warmth without restricting movement.

Scotty

2024-12-31T19:00:00

Rated 5 out of 5

I will buy this product again

Use it for biking, hiking, skiing and all times in the cold

Domenic

2024-12-31T19:00:00

Rated 5 out of 5

Great product!

Great ski base layer.

Jennifer

2024-12-28T19:00:00

Rated 4 out of 5

Consistent Quality

These are lighter than I expected, but they are very comfortable and made with quality in mind.

MICHAEL

2024-12-27T19:00:00

Rated 5 out of 5

Good base layer

Good base layer to keep my lower half warm.

Daniel

2024-12-26T19:00:00

Rated 5 out of 5

Repeat buy!

Repeat purchase because my son loves these for working outside.

Andrea

2024-12-25T19:00:00

Rated 5 out of 5

Quality product

Great quality gloves - gave as a gift - my son is going to love them! Just as described - definitely recommend! Shipped quickly!

Terry

2024-12-25T19:00:00

Rated 5 out of 5

Such a great product

Five stars these long underwear are amazing

Tia

Smartwool Classic All-Season Merino Base Layer Bottom for Men Specifications

  • Material

    Made in China: 88% Merino Wool, 12% Nylon

  • Fit

    Slim fit

  • Lightweight

    Yes

  • Temp Rating

    Classic All-Season
    Warm: 50 Degree +
    Cool: 25 Degree - 50 Degree

  • Inseam

    30.75" (78cm) (Size medium)

  • Care Instructions

    Wash With Like Colors
    Do Not Iron Decorations
    Do Not Dry Clean
    Cool Iron As Needed
    Tumble Dry Low
    Do Not Bleach
    Machine Wash Warm Gentle Cycle

  • UPC Code

    196247543261

SmartWool Men's Base Layer Bottom Size Chart
  S M L XL XXL
Waist (in) 29-31 32-34 35-37 38-40 41-44
Hip (in) 36-38 39-41 42-44 45-48 49-51
Inseam (in) 30-31 31-32 32-33 33-34 34-35

About Smartwool Classic All-Season Merino Base Layer Bottom for Men

FEATURED REVIEWS

Very very warm

By Backpack J.

I got these for backpacking and staying warm in the winter, and I'm very impressed. I've owned running leggings in the past that were thicker and heavier but not as warm. These don't do great against the wind (layering is key) but trap body heat well and are reasonably rugged for how sheer they are. These are warmer than any other tights I own and I can wear them comfortably under jeans or wind pants.

Best ever

By Dan

They don't ride up, they don't sag down! Best long johns I've owned! Keep my legs super warm on a cold day but don't over heat them when I'm hiking 1,500 feet. Must buy!

Unmatched Comfort with Classic All-Season Merino Base Layer Bottom
Experience the ultimate in comfort and performance with the Merino Base Layer Bottom. Designed to keep you comfortable from ski lifts to campsites, these base layer pants are your perfect year-round companion. The updated fit enhances functionality and aesthetics, ensuring these base layer bottoms stay durable and comfortable.

Superior Fit and Durability
The men's base layer features a slim fit that follows the contours of your body for a snug and comfortable feel. The lightweight Merino jersey fabric uses a recycled nylon core to enhance durability while maintaining the softness of 100% Merino wool next to your skin. These Merino wool base layer bottoms are built for all-season use, providing maximum comfort and durability.

Advanced Design for Maximum Comfort
The thermal bottoms are designed with flatlock seam construction to minimize chafing, ensuring all-day comfort. The fully functional fly and Merino-lined elastic waistband add to the comfort and convenience. With a size medium inseam of 30.75 inches (78 cm), these Smartwool long underwear offer a perfect fit for all your adventures.

Smartwool Classic All-Season Merino Base Layer Bottom for Men Features

  • Core Spun technology for durability and comfort
  • Slim fit follows body contours for a snug fit
  • Lightweight Merino jersey fabric with recycled nylon core
  • Flatlock seam construction minimizes chafing
  • Fully functional fly for convenience
  • Merino-lined elastic waistband for maximum comfort
  • Size medium inseam: 30.75 inches (78 cm)
  • Made with 88 percent Merino Wool and 12 percent Nylon
  • Responsibly sourced ultra-soft Merino wool next to skin
  • Perfect for all-season use from skiing to camping

Warranty Information

This product has a limited warranty of 24 months.

Key Features

  • Experience all-day comfort with these Smartwool merino wool base layer bottoms.
  • Stay warm and dry with our moisture-wicking men's base layer during any activity.
  • Enjoy a full range of motion thanks to the slim fit and flexible design of these bottoms.
  • Perfect for layering, these all-season base layer bottoms regulate temperature effectively.
  • Crafted with durable merino wool and nylon, these bottoms are built to last for years.
  • Wear these lightweight base layer bottoms for hiking, skiing, or everyday warmth.