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Men's Underwear

Narrow Category:  Men's Boxers & Briefs   Men's Heavyweight Underwear   Men's Lightweight Underwear   Men's Midweight Underwear
OK, it is the underwear section, but let's look at this honestly; this stuff is purely for business. These are the important base layers that will keep you warm out on the trail by way of anti-wicking materials and use of the best quality fabrics. It is super important that you have a really good base layer working for you, especially when things are looking a little chillier out there. We've got some casual pieces and some that are for your more demanding day trips.
Ex Officio Men's Give-N-Go Boxer 12412171 (Ex Officio)
Ex Officio Men's Give-N-Go Boxer Brief 12412172 (Ex Officio)
Ex Officio Men's Give-N-Go Sport Mesh 6" Boxer Brief 12412336 (Ex Officio)
Ex Officio Men's Give-N-Go Brief 12412173 (Ex Officio)
Ex Officio Men's Give-N-Go Boxer
12412171
Ex Officio Men's Give-N-Go Boxer Brief
12412172
Ex Officio Men's Give-N-Go Sport Mesh 6" Boxer Brief
12412336
Ex Officio Men's Give-N-Go Brief
12412173
$25.95
 
Ex Officio Men's Give-N-Go Boxer 12412171 (Ex Officio)
$25.95
 
Ex Officio Men's Give-N-Go Boxer Brief 12412172 (Ex Officio)
$29.95
 
Ex Officio Men's Give-N-Go Sport Mesh 6" Boxer Brief 12412336 (Ex Officio)
$19.95
 
Ex Officio Men's Give-N-Go Brief 12412173 (Ex Officio)
Patagonia Men's Capilene Daily Boxers 32488 (Patagonia)
Terramar Sports Men's Mesh Pro Boxer-6" W8097 (Terramar Sports)
Smartwool Men's NTS Micro 150 Pattern Boxer Brief SW0NP711 (Smartwool)
Smartwool Men's NTS Micro 150 Boxer Brief SW0NP701 (Smartwool)
Patagonia Men's Capilene Daily Boxers
32488
Terramar Sports Men's Mesh Pro Boxer-6"
W8097
Smartwool Men's NTS Micro 150 Pattern Boxer Brief
SW0NP711
Smartwool Men's NTS Micro 150 Boxer Brief
SW0NP701
$35.00
 
Patagonia Men's Capilene Daily Boxers 32488 (Patagonia)
$17.95
 
Terramar Sports Men's Mesh Pro Boxer-6" W8097 (Terramar Sports)
$49.95
 
Smartwool Men's NTS Micro 150 Pattern Boxer Brief SW0NP711 (Smartwool)
$47.95
 
Smartwool Men's NTS Micro 150 Boxer Brief SW0NP701 (Smartwool)
Icebreaker Men's Anatomica Boxers With Fly Stripe 102207 (Icebreaker)
Patagonia Men's Capilene Thermal Weight Zip-Neck Top 43657 (Patagonia)
Patagonia Men's Capilene Thermal Weight Crew Neck Shirt 43647 (Patagonia)
Patagonia Men's Capilene Thermal Weight Long Underwear Bottoms 43687 (Patagonia)
Icebreaker Men's Anatomica Boxers With Fly Stripe
102207
Patagonia Men's Capilene Thermal Weight Zip-Neck Top
43657
Patagonia Men's Capilene Thermal Weight Crew Neck Shirt
43647
Patagonia Men's Capilene Thermal Weight Long Underwear Bottoms
43687
$39.99
 
Icebreaker Men's Anatomica Boxers With Fly Stripe 102207 (Icebreaker)
$99.00
 
Patagonia Men's Capilene Thermal Weight Zip-Neck Top 43657 (Patagonia)
$89.00
 
Patagonia Men's Capilene Thermal Weight Crew Neck Shirt 43647 (Patagonia)
$89.00
 
Patagonia Men's Capilene Thermal Weight Long Underwear Bottoms 43687 (Patagonia)
Terramar Sports Men's Climasense 2.0 Thermolator Top W7543 (Terramar Sports)
Patagonia Men's Long-Sleeved Capilene Daily T-Shirt 45260 (Patagonia)
Patagonia Men's Capilene Lightweight T-Shirt 45651 (Patagonia)
Icebreaker Men's Everyday Short Sleeve Crewe 101267 (Icebreaker)
Terramar Sports Men's Climasense 2.0 Thermolator Top
W7543
Patagonia Men's Long-Sleeved Capilene Daily T-Shirt
45260
Patagonia Men's Capilene Lightweight T-Shirt
45651
Icebreaker Men's Everyday Short Sleeve Crewe
101267
$34.95
 
Terramar Sports Men's Climasense 2.0 Thermolator Top W7543 (Terramar Sports)
$39.00
 
Patagonia Men's Long-Sleeved Capilene Daily T-Shirt 45260 (Patagonia)
$39.00
 
Patagonia Men's Capilene Lightweight T-Shirt 45651 (Patagonia)
$60.00
 
Icebreaker Men's Everyday Short Sleeve Crewe 101267 (Icebreaker)
Patagonia Men's Capilene Daily T-Shirt 45270 (Patagonia)
Xo Skin Men's 1.0 Short Sleeve Heathered Loose Fit Shirt 100002 (Xo Skin)
Icebreaker Men's Everyday Long Sleeve Crew Shirt 101261 (Icebreaker)
Icebreaker Men's Everyday Long Sleeve Half Zip Shirt 101259 (Icebreaker)
Patagonia Men's Capilene Daily T-Shirt
45270
Xo Skin Men's 1.0 Short Sleeve Heathered Loose Fit Shirt
100002
Icebreaker Men's Everyday Long Sleeve Crew Shirt
101261
Icebreaker Men's Everyday Long Sleeve Half Zip Shirt
101259
$29.00
 
Patagonia Men's Capilene Daily T-Shirt 45270 (Patagonia)
$78.95
 
Xo Skin Men's 1.0 Short Sleeve Heathered Loose Fit Shirt 100002 (Xo Skin)
$70.00
 
Icebreaker Men's Everyday Long Sleeve Crew Shirt 101261 (Icebreaker)
$80.00
 
Icebreaker Men's Everyday Long Sleeve Half Zip Shirt 101259 (Icebreaker)
Xo Skin Men's 4.0 Pulse Compression Shorts 400001 (Xo Skin)
Patagonia Men's Long-Sleeved Capilene Daily Graphic T-Shirt 45280 (Patagonia)
Patagonia Men's Capilene Midweight Zip-Neck Thermal Shirt 44445 (Patagonia)
Under Armour Men's UA Base 2.0 Crew Neck Long Sleeve Top/Shirt 1281080 (Under Armour)
Xo Skin Men's 4.0 Pulse Compression Shorts
400001
Patagonia Men's Long-Sleeved Capilene Daily Graphic T-Shirt
45280
Patagonia Men's Capilene Midweight Zip-Neck Thermal Shirt
44445
Under Armour Men's UA Base 2.0 Crew Neck Long Sleeve Top/Shirt
1281080
$74.95
 
Xo Skin Men's 4.0 Pulse Compression Shorts 400001 (Xo Skin)
$49.00
 
Patagonia Men's Long-Sleeved Capilene Daily Graphic T-Shirt 45280 (Patagonia)
$69.00
 
Patagonia Men's Capilene Midweight Zip-Neck Thermal Shirt 44445 (Patagonia)
$54.95
 
Under Armour Men's UA Base 2.0 Crew Neck Long Sleeve Top/Shirt 1281080 (Under Armour)
Hot Chillys Men's Pepper Bi-Ply Bottom PB3073 (Hot Chillys)
Under Armour Men's UA Base 2.0 Leggings 1281108 (Under Armour)
Smartwool Men's NTS Mid 250 Bottoms NP605 (Smartwool)
Patagonia Men's Capilene Midweight Crew Neck Shirt 44425 (Patagonia)
Hot Chillys Men's Pepper Bi-Ply Bottom
PB3073
Under Armour Men's UA Base 2.0 Leggings
1281108
Smartwool Men's NTS Mid 250 Bottoms
NP605
Patagonia Men's Capilene Midweight Crew Neck Shirt
44425
$34.95
 
Hot Chillys Men's Pepper Bi-Ply Bottom PB3073 (Hot Chillys)
$54.95
 
Under Armour Men's UA Base 2.0 Leggings 1281108 (Under Armour)
$94.95
 
Smartwool Men's NTS Mid 250 Bottoms NP605 (Smartwool)
$59.00
 
Patagonia Men's Capilene Midweight Crew Neck Shirt 44425 (Patagonia)
Terramar Sports Men's Climasense 2.0 Thermolator Bottom W7541 (Terramar Sports)
Smartwool Men's NTS Mid 250 Crew Neck Shirt NP600 (Smartwool)
Patagonia Men's Capilene Midweight Long Underwear Bottoms 44485 (Patagonia)
Patagonia Men's Capilene Daily Boxers 32487 (Patagonia)
Terramar Sports Men's Climasense 2.0 Thermolator Bottom
W7541
Smartwool Men's NTS Mid 250 Crew Neck Shirt
NP600
Patagonia Men's Capilene Midweight Long Underwear Bottoms
44485
Patagonia Men's Capilene Daily Boxers
32487
$34.95
 
Terramar Sports Men's Climasense 2.0 Thermolator Bottom W7541 (Terramar Sports)
$94.95
 
Smartwool Men's NTS Mid 250 Crew Neck Shirt NP600 (Smartwool)
$59.00
 
Patagonia Men's Capilene Midweight Long Underwear Bottoms 44485 (Patagonia)
$35.00
 
Patagonia Men's Capilene Daily Boxers 32487 (Patagonia)
Patagonia Men's Capilene Daily Boxer Briefs 32477 (Patagonia)
Terramar Sports Men's Silk Underwear L/S Top S481 (Terramar Sports)
Xo Skin Men's 4.0 Pulse Compression Capris 400002 (Xo Skin)
Patagonia Men's Capilene Lightweight Long Underwear Bottoms 45681 (Patagonia)
Patagonia Men's Capilene Daily Boxer Briefs
32477
Terramar Sports Men's Silk Underwear L/S Top
S481
Xo Skin Men's 4.0 Pulse Compression Capris
400002
Patagonia Men's Capilene Lightweight Long Underwear Bottoms
45681
$29.00
 
Patagonia Men's Capilene Daily Boxer Briefs 32477 (Patagonia)
$49.95
 
Terramar Sports Men's Silk Underwear L/S Top S481 (Terramar Sports)
$84.95
 
Xo Skin Men's 4.0 Pulse Compression Capris 400002 (Xo Skin)
$49.00
 
Patagonia Men's Capilene Lightweight Long Underwear Bottoms 45681 (Patagonia)
Terramar Sports Men's EC2 Silk Underwear Bottoms S483 (Terramar Sports)
Arc'teryx Women's Rho LT Bottom 16265 (Arc'teryx)
Smartwool Men's NTS Micro 150 Pattern T-Shirt NP707 (Smartwool)
Patagonia Men's Merino Lightweight T-Shirt 36352 (Patagonia)
Terramar Sports Men's EC2 Silk Underwear Bottoms
S483
Arc'teryx Women's Rho LT Bottom
16265
Smartwool Men's NTS Micro 150 Pattern T-Shirt
NP707
Patagonia Men's Merino Lightweight T-Shirt
36352
$49.95
 
Terramar Sports Men's EC2 Silk Underwear Bottoms S483 (Terramar Sports)
$88.95
 
Arc'teryx Women's Rho LT Bottom 16265 (Arc'teryx)
$74.95
 
Smartwool Men's NTS Micro 150 Pattern T-Shirt NP707 (Smartwool)
$69.00
 
Patagonia Men's Merino Lightweight T-Shirt 36352 (Patagonia)
Terramar Sports Men's 1.0 Tech Skins Tall Bottoms W8347T (Terramar Sports)
Icebreaker Everyday Leggings with Fly 101266 (Icebreaker)
Hot Chillys Men's Micro-Elite 8K Ankle Tight HC9910 (Hot Chillys)
The North Face Men's Summit Series L1 Top NF0A2TPU (The North Face)
Terramar Sports Men's 1.0 Tech Skins Tall Bottoms
W8347T
Icebreaker Everyday Leggings with Fly
101266
Hot Chillys Men's Micro-Elite 8K Ankle Tight
HC9910
The North Face Men's Summit Series L1 Top
NF0A2TPU
$21.95
 
Terramar Sports Men's 1.0 Tech Skins Tall Bottoms W8347T (Terramar Sports)
$70.00
 
Icebreaker Everyday Leggings with Fly 101266 (Icebreaker)
$54.95
 
Hot Chillys Men's Micro-Elite 8K Ankle Tight HC9910 (Hot Chillys)
$124.95
 
The North Face Men's Summit Series L1 Top NF0A2TPU (The North Face)
Under Armour Men's UA Base 2.0 Crew Neck Long Sleeve Top/Shirt 1239724 (Under Armour)
Smartwool Men's NTS Mid 250 Zip T Top NP603 (Smartwool)
Hot Chillys Men's Pepper Bi-Ply Crewneck PB3071 (Hot Chillys)
Xo Skin Men's 1.0 Short Sleeve Loose Fit Shirt 100001 (Xo Skin)
Under Armour Men's UA Base 2.0 Crew Neck Long Sleeve Top/Shirt
1239724
Smartwool Men's NTS Mid 250 Zip T Top
NP603
Hot Chillys Men's Pepper Bi-Ply Crewneck
PB3071
Xo Skin Men's 1.0 Short Sleeve Loose Fit Shirt
100001
$54.95
 
Under Armour Men's UA Base 2.0 Crew Neck Long Sleeve Top/Shirt 1239724 (Under Armour)
$99.95
 
Smartwool Men's NTS Mid 250 Zip T Top NP603 (Smartwool)
$34.95
 
Hot Chillys Men's Pepper Bi-Ply Crewneck PB3071 (Hot Chillys)
$78.95
 
Xo Skin Men's 1.0 Short Sleeve Loose Fit Shirt 100001 (Xo Skin)
Xo Skin Men's 2.0 Sleeveless Form Fit V-Neck Shirt 200002 (Xo Skin)
Xo Skin Men's 2.0 Short Sleeve Form Fit Crew Shirt 200003 (Xo Skin)
Xo Skin Men's 2.0 3/4 Sleeve Form Fit Crew Shirt 200005 (Xo Skin)
Xo Skin Men's 2.0 Sleeveless Form Fit Shirt 200001 (Xo Skin)
Xo Skin Men's 2.0 Sleeveless Form Fit V-Neck Shirt
200002
Xo Skin Men's 2.0 Short Sleeve Form Fit Crew Shirt
200003
Xo Skin Men's 2.0 3/4 Sleeve Form Fit Crew Shirt
200005
Xo Skin Men's 2.0 Sleeveless Form Fit Shirt
200001
$65.95
 
Xo Skin Men's 2.0 Sleeveless Form Fit V-Neck Shirt 200002 (Xo Skin)
$78.95
 
Xo Skin Men's 2.0 Short Sleeve Form Fit Crew Shirt 200003 (Xo Skin)
$83.95
 
Xo Skin Men's 2.0 3/4 Sleeve Form Fit Crew Shirt 200005 (Xo Skin)
$65.95
 
Xo Skin Men's 2.0 Sleeveless Form Fit Shirt 200001 (Xo Skin)
The North Face Men's Summit Series L1 Pants NF0A2T9V (The North Face)
Xo Skin Men's 2.0 Long Sleeve Form Fit V-Neck Shirt 200008 (Xo Skin)
Hot Chillys Men's Micro-Elite Chamois Boot Tech Tight HC9633 (Hot Chillys)
Xo Skin Men's 2.0 Short Sleeve Form Fit V-Neck Shirt 200004 (Xo Skin)
The North Face Men's Summit Series L1 Pants
NF0A2T9V
Xo Skin Men's 2.0 Long Sleeve Form Fit V-Neck Shirt
200008
Hot Chillys Men's Micro-Elite Chamois Boot Tech Tight
HC9633
Xo Skin Men's 2.0 Short Sleeve Form Fit V-Neck Shirt
200004
$124.95
 
The North Face Men's Summit Series L1 Pants NF0A2T9V (The North Face)
$88.95
 
Xo Skin Men's 2.0 Long Sleeve Form Fit V-Neck Shirt 200008 (Xo Skin)
$44.95
 
Hot Chillys Men's Micro-Elite Chamois Boot Tech Tight HC9633 (Hot Chillys)
$78.95
 
Xo Skin Men's 2.0 Short Sleeve Form Fit V-Neck Shirt 200004 (Xo Skin)
Volcom Men's First Layer Crew Neck Long Sleeve Thermal Shirt G2151600 (Volcom)
Xo Skin Men's 2.0 Long Sleeve Form Fit Crew Shirt 200007 (Xo Skin)
Icebreaker Mens Oasis Long Sleeve Hood Top 100478 (Icebreaker)
Under Armour Men's UA ColdGear Infrared Fitted Mock Neck Long Sleeve Top/Shirt 1238393 (Under Armour)
Volcom Men's First Layer Crew Neck Long Sleeve Thermal Shirt
G2151600
Xo Skin Men's 2.0 Long Sleeve Form Fit Crew Shirt
200007
Icebreaker Mens Oasis Long Sleeve Hood Top
100478
Under Armour Men's UA ColdGear Infrared Fitted Mock Neck Long Sleeve Top/Shirt
1238393
$59.95
 
Volcom Men's First Layer Crew Neck Long Sleeve Thermal Shirt G2151600 (Volcom)
$88.95
 
Xo Skin Men's 2.0 Long Sleeve Form Fit Crew Shirt 200007 (Xo Skin)
$110.00
 
Icebreaker Mens Oasis Long Sleeve Hood Top 100478 (Icebreaker)
$54.95
 
Under Armour Men's UA ColdGear Infrared Fitted Mock Neck Long Sleeve Top/Shirt 1238393 (Under Armour)
Xo Skin Men's 2.0 3/4 Sleeve Form Fit V-Neck Shirt 200006 (Xo Skin)
 
Xo Skin Men's 2.0 3/4 Sleeve Form Fit V-Neck Shirt
200006
 
$83.95
 
Xo Skin Men's 2.0 3/4 Sleeve Form Fit V-Neck Shirt 200006 (Xo Skin)