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"Under Armour" > Apparel > Men's Apparel > Men's Base Layer >

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Outfit yourself in the right clothes for your next adventure. Our rainwear and outerwear will keep you dry and warm, while our baselayers help you prepare for changing temps. You'll find performance and tactical clothes from Beretta, Under Armour and 5.11 Tactical, fishing clothes from Columbia, and more apparel from The North Face, Marmot, and Carhartt.

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Under Armour Men's Base 4.0 Legging
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Under Armour Men's Base 4.0 Legging

Key Features
  • Rugged 96% polyester, 4% elastane ColdGear fabric

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for maximum mobility

  • ArmourBlock antimicrobial technology fights odors

  • Signature Moisture Transport System wicks sweat

$84.99
$64.96
Under Armour Men's The Original 9" Boxerjock Boxer Briefs
Free Gift Card Offer

Under Armour Men's The Original 9" Boxerjock Boxer Briefs

Key Features
  • 90% polyester, 10% elastane HeatGear fabric

  • Four-way stretch properties for increased mobility

  • Signature Moisture Transport System wicks sweat

  • ArmourBlock antimicrobial technology fights odors

  • Smooth flatlock seams help reduce chafing

$20.00
Under Armour Men's The Original 6" Boxerjock
Free Gift Card Offer

Under Armour Men's The Original 6" Boxerjock

Key Features
  • 4-way stretch 88% polyester, 12% elastane

  • HeatGear technology: cool, dry, and light

  • Superior moisture transport

  • ArmourBlock anti-odor technology helps reduce odor

  • Tagless interior

$19.99 - $20.00
Under Armour Men's Base 4.0 Long-Sleeve Crew Shirt
Free Gift Card Offer

Under Armour Men's Base 4.0 Long-Sleeve Crew Shirt

Key Features
  • Rugged 96% polyester, 4% elastane ColdGear fabric

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for maximum mobility

  • ArmourBlock antimicrobial technology fights odors

  • Signature Moisture Transport System wicks sweat

$84.99
$64.96
Under Armour Men's Ridge EwPCamo 6 BoxerJock 2.0 Boxer Brief
Free Gift Card Offer

New! Under Armour Men's Ridge EwPCamo 6” BoxerJock 2.0 ...

Key Features
  • Lightweight 90% polyester, 10% elastane fabric

  • Dries quickly, wicks moisture, has lots of stretch

  • ArmourBlock antimicrobial finish reduces odors

  • Breathable mesh front panel; functional fly

  • Branded elastic waistband for distinctive style

$29.99
Under Armour Men's Ridge Reaper Boxerjock Boxer
Free Gift Card Offer

Under Armour Men's Ridge Reaper Boxerjock Boxer

Key Features
  • Made of 90% polyester/10% elastane fabric

  • HeatGear fabric designed to keep you cool

  • Moisture Transport System wicks away sweat

  • 4-Way Stretch fabric for greater mobility

  • Anti-Odor technology blocks odor-causing bacteria

$29.99
Under Armour Men's Base 2.0 Legging
Free Gift Card Offer

Under Armour Men's Base 2.0 Legging

Key Features
  • 93% polyester, 7% elastane ColdGear thermal fabric

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for maximum mobility

  • ArmourBlock antimicrobial technology fights odors

  • Signature Moisture Transport System wicks sweat

$59.99
$42.96
Under Armour Men's Extreme Base Baselayer Top
Free Gift Card Offer

Under Armour Men's Extreme Base Baselayer Top

Key Features
  • Moisture-wicking 100% polyester shell

  • High-pile fleece lining for superior warmth

  • UA Scent Control; ArmourBlock anti-odor treatment

  • Strategic stretch panels offer an improved fit

  • Mock-neck collar; quarter-length front zipper

$79.99 - $89.99
Under Armour Men's ColdGear Infrared EVO Mock-Neck Shirt
Free Gift Card Offer

Under Armour Men's ColdGear Infrared EVO Mock-Neck Shirt

Key Features
  • 87% polyester, 13% elastane ColdGear fabric

  • Slick, fast-drying exterior; soft, cozy interior

  • Four-way stretch fabrication for maximum mobility

  • Signature Moisture Transport System wicks sweat

  • ColdGear Infrared printed interior traps heat

$54.99 - $59.99
$41.96
Under Armour Men's Extreme Base Baselayer Bottom
Free Gift Card Offer

Under Armour Men's Extreme Base Baselayer Bottom

Key Features
  • Moisture-wicking 100% polyester shell

  • High-pile fleece lining for superior warmth

  • UA Scent Control; ArmourBlock anti-odor treatment

  • Strategic stretch panels offer an improved fit

  • Off-axis set waistband for additional coverage

$79.99 - $89.99
Under Armour Men's Base 4.0 Crew
Free Gift Card Offer

Under Armour Men's Base 4.0 Crew

Key Features
  • 4-way stretch, 7.25-oz. 96% polyester, 4% elastane

  • Base 4.0: ultra warmth for "brutally" cold weather

  • ColdGear technology: warm, dry, and light

  • ArmourBlock anti-odor technology helps reduce BO

  • Ergonomic flatlock seams and raglan sleeves

$84.99
$59.94
Under Armour Men's Base 3.0 Long-Sleeve Crew Shirt
Free Gift Card Offer

Under Armour Men's Base 3.0 Long-Sleeve Crew Shirt

Key Features
  • Rugged 93% polyester, 7% elastane ColdGear fabric

  • Patented negative grid interior traps hot air

  • Four-way stretch fabrication for maximum mobility

  • ArmourBlock antimicrobial technology fights odors

  • Signature Moisture Transport System wicks sweat

$74.99
$56.96
Under Armour Men's Base 2.0 Long-Sleeve Crew Shirt
Free Gift Card Offer

Under Armour Men's Base 2.0 Long-Sleeve Crew Shirt

Key Features
  • 93% polyester, 7% elastane ColdGear thermal fabric

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for maximum mobility

  • ArmourBlock antimicrobial technology fights odors

  • Signature Moisture Transport System wicks sweat

$59.99
$42.96

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Results 1 - 13 of 13  Page 1 of 1