---
product_id: 235771641
title: "Smartwool Men's Classic Thermal Merino Base Layer Bottom"
brand: "smartwool"
price: "$269.28"
currency: USD
in_stock: true
reviews_count: 9
category: "Smartwool"
url: https://www.desertcart.us/products/235771641-smartwool-mens-classic-thermal-merino-base-layer-bottom
store_origin: US
region: United States of America
---

# Smartwool Men's Classic Thermal Merino Base Layer Bottom

**Brand:** smartwool
**Price:** $269.28
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Smartwool Men's Classic Thermal Merino Base Layer Bottom by smartwool
- **How much does it cost?** $269.28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/235771641-smartwool-mens-classic-thermal-merino-base-layer-bottom)

## Best For

- smartwool enthusiasts

## Why This Product

- Trusted smartwool brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Buy SmartWool SW016361001M Men's Merino 250 Baselayer Bottom Black M: Active Base Layers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Good quality - 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.
Review: Extremely Warm - These Base Layer Bottoms are extremely thin and extremely warm in cold weather. I've been wearing them for exercise under thin jogging pants in outdoor weather around 30 degrees and my legs never, ever get cold. They feel great and are well made.

## 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 fabric—perfect 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B083QDVWTX |
| Age Range Description | Adult |
| Apparel Closure Orientation | Front |
| Apparel Closure Type | Snap |
| Apparel Fabric Stretch | Low Stretch |
| Apparel Fabric Weight Class | Medium Weight |
| Apparel Occasion and Lifestyle | outdoor adventure |
| Best Sellers Rank | #187,212 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #62 in Men's Base Layers #63 in Men's Thermal Underwear Bottoms |
| Brand Name | Smartwool |
| Color | Black |
| Customer Reviews | 4.7 out of 5 stars 638 Reviews |
| Fabric Stretchability | Stretchable |
| Fabric Type | 100% Merino Wool |
| Fit Type | Slim |
| Fit to Size Sentiment | Positive |
| Front Pleat Type | Flat Front |
| Garment Size Country | Vietnam |
| Global Trade Identification Number | 00193392652664 |
| Import Designation | Made in the USA |
| Inseam Length | 21.5 inches |
| Item Length Description | Ankle Length |
| Item Type Name | Men's Merino 250 Baselayer Bottom |
| Item Weight | 9.28 ounces |
| Leg Style | Slim |
| Lining Description | 100% Merino wool |
| Manufacturer | Smartwool |
| Manufacturer Part Number | SW016361001-M |
| Material Type | Wool |
| Model Name | Merino 250 Base Layer Bottoms |
| Number Of Pockets | 5 |
| Number of Items | 1 |
| Occasion Type | hiking |
| Pants Form Type | Leggings |
| Pattern | Solid |
| Pattern Style | Solid |
| Product Care Instructions | Machine Wash |
| Rise Style | High Rise |
| Sleeve Length Description | 3/4 Sleeve |
| Style Name | Merino 250 Base Layer Bottoms |
| Style Number | Smartwool |
| Team Name | Smartwool |
| UPC | 193392652664 |
| Unit Count | 1 Count |
| Waist Size | 33 inches |
| Weave Type | Plain |
| character | Sports |

## Images

![Smartwool Men's Classic Thermal Merino Base Layer Bottom - Image 1](https://m.media-amazon.com/images/I/41TzA+ljY-L.jpg)
![Smartwool Men's Classic Thermal Merino Base Layer Bottom - Image 2](https://m.media-amazon.com/images/I/51b2l1s0XGL.jpg)
![Smartwool Men's Classic Thermal Merino Base Layer Bottom - Image 3](https://m.media-amazon.com/images/I/51UVnZ5JosL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: Size Why should I order with a 32 inch waist and a 34 inch out seemWhen ordering smart wool men’s pants**
A: I am 6"1 34 waist medium was perfect fit.

**Q: what size should I order to man 6'3" 175 pounds 35" waist?  And do smartwool men's bottoms come in light weight, medium and heavy?  Thank you**
A: Hi there, 
a medium accommodates up to a 34'' waist, and a size large accommodate a size 35'' waist to 37''.

**Q: I have a 27" waist and a 36" inseam.  which size pants and shirts should i order? ps, i'm female but no one has my inseam it seams.**
A: I have a 31" waist and 31" inseam.  The men's Medium size fits me well.  Good luck from Seattle

**Q: are these good for working out in the garage or doing yard work when it's about 50 degrees?**
A: They are very comfortable, so I do not see why they would not work well under those conditions. I wore these for extra warmth walking many miles throughout Japan in November of 2022. The temperature in the morning was around 45F to 54F.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality
*by A***M on January 3, 2026*

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.

### ⭐⭐⭐⭐⭐ Extremely Warm
*by S***T on February 7, 2025*

These Base Layer Bottoms are extremely thin and extremely warm in cold weather. I've been wearing them for exercise under thin jogging pants in outdoor weather around 30 degrees and my legs never, ever get cold. They feel great and are well made.

### ⭐⭐⭐⭐⭐ Worth the $$
*by L***H on January 15, 2026*

So comfortable; looking forward to being in below freezing with these on!

## Frequently Bought Together

- Smartwool Men's Classic Thermal Merino Base Layer Bottom
- Smartwool Men's Classic Thermal Merino Wool Base Layer Crew (Slim Fit)
- Smartwool Women's Classic Thermal Merino Baselayer Crew

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-13*