Skip to content

JAX Store Locations

Search

Menu

Men
Women
Kids
Outdoor Gear
Livestock & Animal Care
Tools & Hardware

Mens Long Underwear and Base Layers

Sort by

Featured
Most relevant
Best selling
Alphabetically, A-Z
Alphabetically, Z-A
Price, low to high
Price, high to low
Date, old to new
Date, new to old

Compare

View as List Grid

FiltersFilter & Sort

Applied Filters

Clear all

Sort by

Featured
Most relevant
Best selling
Alphabetically, A-Z
Alphabetically, Z-A
Price, low to high
Price, high to low
Date, old to new
Date, new to old

Price

From $

-

To $

From To

Clear

Brand

Carhartt (13)
Columbia (2)
Hot Chillys (2)
Patagonia (1)
Polar Max (4)
Smartwool (11)

Clear

Product type

Base Layer (2)
Base Layer - Bottoms (5)
Base Layer - Tops (5)
Base Layer Bottoms (3)
Base Layer Tops (3)
Base Layers (2)
Casual Pants (3)
Sportswear Tops (5)

Clear

Color

Black (16)
Black Color Shift (1)
Black color shift (1)
Black heather (5)
Blubrryhll/lagunablu (1)
Burnt olive heather (3)
Charcoal heather (2)
Charcoal Heather (1)
Deep Navy (1)
Deep navy (1)
Deepnavycolorshift (1)
Iron Heather (3)
Iron heather (1)
Light Gray Heather (1)
Mink color shift (1)
Mink heather (1)
Navy (1)
Nightfall blue (1)
Nival Blue (1)
North Woods Heather (1)
OD Green (2)
Red (1)
Shadow heather (3)
Small Currents: Endless Blue (1)
Winter moss forest (1)
Winter moss heather (2)

Clear

Availability

In stock (33)
Out of stock (32)

Clear

On Sale

Yes (8)
No (25)

Clear

Compare
Smartwool
Men's Classic Thermal Merino Base Layer Bottom

From $125.00 USD

View details
Compare

Columbia
Men's Omni-heat Midweight Baselayer Tights

$55.00 USD

View details
Compare

Columbia
Men’s Omni-Heat Midweight Baselayer Crew

$55.00 USD

View details
Compare

Carhartt
Men's Classic Cotton-poly Union Suit

$59.99 USD

View details
Compare
Smartwool
Mens Classic All-season Merino Base Layer Long Sleeve

From $90.00 USD

View details
Compare
Smartwool
Mens Classic Thermal Merino Base Layer Crew

From $125.00 USD

View details
Compare

Carhartt
Men's Base Force 100% Cotton Midweight Bottom

$34.99 USD

View details
Compare
Patagonia
Men's Capilene Midweight Bottoms - Small Currents: Endless Blue

$44.50 USD ~~$89.00~~

View details
Compare
Carhartt
Men's Base Force Heavyweight Poly-wool Bottom

$49.99 USD

View details
Compare
Smartwool
Men's Classic All-Season Merino Base Layer Bottom - Iron Heather

$90.00 USD

View details
Compare
Carhartt
Men's Force Heavyweight Heathered Knit Base Layer Crewneck Pocket Top

$51.99 USD

View details
Compare
Smartwool
Mens Classic Thermal Merino Base Layer 1/4 Zip

From $60.00 USD ~~$120.00~~

View details
Compare

Polar Max
Men's Double Layer Bottoms - OD Green

$32.00 USD

View details
Compare

Carhartt
Men's Base Force Midweight Classic Crew

$34.99 USD

View details
Compare
Smartwool
Men's Classic Thermal Merino Base Layer Quarter-Zip - Black Color Shift

$60.00 USD ~~$120.00~~

View details
Compare
Carhartt
Men's Base Force Heavyweight Bottom

$49.99 USD

View details

Previous
Page 1 / 3
1
2
3
Next

Your cart

Your cart is empty

Subtotal:$0.00 USD

Loading...

Explore JAX

Gift Cards
Locations
About JAX
Careers
Blog
Contact
Shipping
Returns

Subscribe to JAX Emails

Sign up for exclusive offers, sales, events and more!

Email

JAX is a family owned company. Our mission is to provide outstanding customer service and quality products.

The JAX Story

Facebook
YouTube
Instagram

© 2026 JAXOutdoorGearFarmandRanch.

Compare /3

Loading...

Loading...

Choose options

Item added to your cart.

View cart