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Icebreaker Men's Anatomica Boxer
  • BLUE
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • BLUE
  • RED
  • RED

Icebreaker
Men's Anatomica Boxer

$31.99 - $42.95
up to 20% off
Smartwool Men's NTS Mid 250 Zip T
  • BLACK
  • BLACK
  • BLACK
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • BROWN
  • GREEN
  • GREY
  • RED
  • RED

Smartwool
Men's NTS Mid 250 Zip T

$59.99 - $109.95
up to 40% off
Smartwool Women's Merino 250 Baselayer Bottom
  • BLACK
  • BLACK
  • BLACK
  • BLACK
  • BLUE
  • BLUE
  • GREY
  • GREY
  • GREY
  • PINK
  • PURPLE
  • PURPLE
  • PURPLE
  • PURPLE
  • RED

Smartwool
Women's Merino 250 Baselayer Bottom

$73.99 - $99.95
up to 22% off
Icebreaker Women's Vertex LS Half Zip Flurry Top
  • BLUE
  • BLACK
  • GREY

Icebreaker
Women's Vertex LS Half Zip Flurry Top

$111.99 - $140.00
up to 20% off
Smartwool Women's Merino 150 Baselayer SS Top
  • GREY
  • BLACK
  • BLUE
  • BLUE
  • GREEN
  • GREY
  • PINK
  • PINK
  • PINK
  • PINK
  • RED

Smartwool
Women's Merino 150 Baselayer SS Top

$55.99 - $74.95
up to 25% off
Icebreaker Women's Oasis Leggings
  • GREY
  • BLACK
  • GREY

Icebreaker
Women's Oasis Leggings

From $66.99   $90.00
up to 26% off
Arcteryx Women's RHO LT Zip Neck Baselayer
  • BLUE
  • BLACK
  • BLUE
  • BROWN
  • ORANGE
  • PURPLE
  • YELLOW

Arcteryx
Women's RHO LT Zip Neck Baselayer

$92.99 - $125.00
up to 26% off
Icebreaker Men's Oasis LS Crewe
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • BLUE
  • GREY
  • GREY
  • RED

Icebreaker
Men's Oasis LS Crewe

$49.99 - $90.00
up to 44% off
ExOfficio Men's Give-N-Go Boxer Brief
  • BLUE
  • BLACK
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • BLUE
  • KHAKI
  • RED
  • WHITE

ExOfficio
Men's Give-N-Go Boxer Brief

$16.99 - $29.95
up to 35% off
Icebreaker Men's Anatomica Zone Long Boxer
  • BLUE
  • BLACK
  • BLUE
  • BLUE
  • GREEN
  • ORANGE

Icebreaker
Men's Anatomica Zone Long Boxer

$51.99 - $64.95
up to 20% off
Icebreaker Men's Tech Top LS Crewe
  • KHAKI
  • BLUE
  • GREY
  • YELLOW

Icebreaker
Men's Tech Top LS Crewe

$60.99   $110.00
45% off
Icebreaker Women's Oasis LS Half Zip
  • BLACK
  • BLUE
  • GREY
  • GREY
  • PINK

Icebreaker
Women's Oasis LS Half Zip

$74.99 - $100.00
up to 25% off
Patagonia Women's Capilene Midweight Crew
  • PURPLE
  • BLACK
  • BLUE
  • GREY

Patagonia
Women's Capilene Midweight Crew

$43.99 - $59.00
up to 25% off
ExOfficio Men's Give-N-Go Boxer
  • BLUE
  • BLACK
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • KHAKI
  • PINK
  • RED
  • WHITE

ExOfficio
Men's Give-N-Go Boxer

$19.99 - $29.95
up to 23% off
Arcteryx Women's Phase AR Zip Neck LS Top
  • RED
  • BLACK
  • BROWN
  • PINK

Arcteryx
Women's Phase AR Zip Neck LS Top

$65.99 - $89.00
up to 26% off
Icebreaker Women's Oasis LS Crewe
  • BLUE
  • BLACK
  • GREY
  • PURPLE

Icebreaker
Women's Oasis LS Crewe

From $66.99   $90.00
up to 26% off
Arcteryx Women's Satoro AR Zip Neck LS Top
  • PINK
  • BLACK
  • BLUE
  • GREEN
  • PINK

Arcteryx
Women's Satoro AR Zip Neck LS Top

$103.99 - $139.00
up to 25% off
Arcteryx Men's RHO LT Zip Neck
  • BLUE
  • BLACK
  • BLUE
  • KHAKI
  • RED

Arcteryx
Men's RHO LT Zip Neck

$99.99 - $125.00
up to 20% off
Arcteryx Women's RHO AR Zip Neck
  • BLUE
  • BLACK
  • GREEN
  • ORANGE
  • RED

Arcteryx
Women's RHO AR Zip Neck

$107.99 - $145.00
up to 26% off
Icebreaker Men's Everyday Leggings with Fly
  • GREY
  • BLACK
  • GREEN

Icebreaker
Men's Everyday Leggings with Fly

From $51.99   $70.00
up to 26% off
Icebreaker Women's Sprite Racerback Bra
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • GREEN
  • GREY
  • PINK
  • PURPLE
  • RED

Icebreaker
Women's Sprite Racerback Bra

$44.99 - $60.00
up to 25% off
Icebreaker Women's Siren Bikini
  • BROWN
  • BLACK
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • BLUE
  • GREEN
  • GREY
  • OFFWHITE
  • PINK
  • PINK
  • PURPLE
  • RED

Icebreaker
Women's Siren Bikini

$21.99 - $30.00
up to 27% off
Patagonia Men's Capilene Midweight Crew
  • GREY
  • BLACK
  • RED

Patagonia
Men's Capilene Midweight Crew

$41.99 - $59.00
up to 29% off
Arcteryx Men's Phase SL Boxer
  • PURPLE
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • GREEN
  • GREEN
  • GREY
  • GREY
  • ORANGE
  • RED
  • RED

Arcteryx
Men's Phase SL Boxer

$35.99 - $45.00
up to 20% off
Icebreaker Women's Siren LS Sweetheart Top
  • BLUE
  • BLACK
  • GREEN
  • GREY
  • KHAKI
  • PINK
  • PURPLE
  • WHITE
  • WHITE

Icebreaker
Women's Siren LS Sweetheart Top

$56.99 - $80.00
up to 29% off
Patagonia Men's Capilene Lightweight T-Shirt
  • GREY
  • BLACK
  • BLUE
  • RED

Patagonia
Men's Capilene Lightweight T-Shirt

$27.99 - $39.00
up to 28% off
Smartwool Women's Merino 150 Baselayer LS Top
  • GREY
  • BLACK
  • BLUE
  • GREY
  • PINK
  • PINK
  • RED

Smartwool
Women's Merino 150 Baselayer LS Top

$50.99 - $79.95
up to 36% off
Arcteryx Men's Phase SL Zip LS Neck
  • BLUE
  • BLACK
  • BLUE

Arcteryx
Men's Phase SL Zip LS Neck

$59.99 - $85.00
up to 29% off
Icebreaker Women's Sprite Hot Pant
  • RED
  • BLACK
  • BLACK
  • BLUE
  • BLUE
  • BLUE
  • GREY
  • PURPLE
  • PURPLE
  • RED

Icebreaker
Women's Sprite Hot Pant

$29.99 - $40.00
up to 25% off
Icebreaker Men's Oasis LS Half Zip
  • KHAKI
  • BLACK
  • BLUE

Icebreaker
Men's Oasis LS Half Zip

From $54.99   $100.00
up to 45% off
Icebreaker Men's Everyday LS Half Zip
  • GREEN
  • BLACK

Icebreaker
Men's Everyday LS Half Zip

$59.99   $80.00
25% off
Load (48) more products

 

About Base Layers:

Base layers are the foundation of a well-layered system. From merino wool to synthetic materials, base layers are constructed with high-performance materials that keep you dry and comfortable. They’re insanely versatile. Simply wear one as a single layer for chilly morning runs or use it as the first layer under a fleece pullover or jacket on a winter hike.

Also known as thermal underwear, base layers are easy to wear and easy to care for. Merino wool has all the benefits of regular wool, just without the itch. Its durable fibers wick away sweat and moisture to keep you dry and comfortable. Naturally odor-resistant, you’ll stay fresher for longer because of anti-microbial properties. On the other hand, synthetic materials are budget-friendly, combining performance and value. Both materials regulate your body temperature, allowing you to wear them in a variety of environments. They’ll keep cool in the summer and warm in the winter.

One-piece suits, leggings, shirts, long-sleeves and even underwear, base layers feel like second skin and are anti-chafing thanks to flat seams. They easily move with you without any extra bulk, bunching or creeping up. Lightweight with next-to-skin comfort, they get the job done and look good while doing it. From hunting to running, skiing to tailgating, these base layers and long underwear check all the boxes and then some.

 

Check out more Base Layers: