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

Men's Base Layer - We have versatile men's warm base layer clothing to handle all your outdoor activities, designed to work with your body whether your trail running, hiking or just hitting the town while withstanding harsh weather conditions. Our selection offer heavyweight, midweight, and lightweight comfortable thermal wear with antimicrobial treatment to help reduce odors from excellent brands by Carhartt, Guide Series, Terramar, and Under Amour.

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

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
Under Armour Men's ColdGear Infrared EVO Legging

Under Armour Men's ColdGear Infrared EVO Legging

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
Under Armour Men's Base 4.0 Legging

New! Under Armour Men's Base 4.0 Legging

Key Features
  • 92% polyester, 8% elastane ColdGear fabric

  • ArmourBlock antimicrobial finish reduces odors

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for ease of movement

  • Signature Moisture Transport System wicks sweat

$84.99
$63.74
Under Armour Men's Base 4.0 Long-Sleeve Crew Shirt

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

Key Features
  • 92% polyester, 8% elastane ColdGear fabric

  • ArmourBlock antimicrobial finish reduces odors

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for ease of movement

  • Signature Moisture Transport System wicks sweat

$84.99
$63.74
Under Armour Men's Extreme Base Baselayer Top

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
$59.99 - $67.49
Under Armour Men's Extreme Base Baselayer Bottom

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
$59.99 - $67.49
Under Armour Men's Base 2.0 Long-Sleeve Crew Shirt

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

Key Features
  • 95% polyester, 5% elastane ColdGear fabric

  • ArmourBlock antimicrobial finish reduces odors

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for ease of movement

  • Signature Moisture Transport System wicks sweat

$54.99
$41.24
Under Armour Men's Base 2.0 Legging

New! Under Armour Men's Base 2.0 Legging

Key Features
  • 95% polyester, 5% elastane ColdGear fabric

  • ArmourBlock antimicrobial finish reduces odors

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for ease of movement

  • Signature Moisture Transport System wicks sweat

$54.99
$41.24
Under Armour Men's Base 3.0 Legging

New! Under Armour Men's Base 3.0 Legging

Key Features
  • 92% polyester, 8% elastane ColdGear fabric

  • ArmourBlock antimicrobial finish reduces odors

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for ease of movement

  • Signature Moisture Transport System wicks sweat

$74.99
$56.24
Under Armour Men's Base 3.0 Long-Sleeve Crew Shirt

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

Key Features
  • 92% polyester, 8% elastane ColdGear fabric

  • ArmourBlock antimicrobial finish reduces odors

  • Soft, brushed negative grid interior traps hot air

  • Four-way stretch fabrication for ease of movement

  • Signature Moisture Transport System wicks sweat

$74.99
$56.24
Under Armour Men's The Original 9" BoxerJock Boxer Brief

Under Armour Men's The Original 9" BoxerJock Boxer Brief

Key Features
  • 4.7-oz., 90% polyester/10% elastane fabric

  • Four-way stretch for mobility and shape retention

  • Signature Moisture Transport System wicks sweat

  • Anti-odor technology keeps you fresher longer

  • Flatlock seam construction helps reduce chafing

$22.00
$20.00
Under Armour Men's The Original 6" BoxerJock Boxer Brief

Under Armour Men's The Original 6" BoxerJock Boxer Brief

Key Features
  • 4.7-oz., 90% polyester/10% elastane fabric

  • Four-way stretch for mobility and shape retention

  • Signature Moisture Transport System wicks sweat

  • Anti-odor technology keeps you fresher longer

  • Flatlock seam construction helps reduce chafing

$20.00
Under Armour Men's Base 4.0 Long-Sleeve Crew Shirt

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 Camo 6" BoxerJock 2.0 Boxer Brief

Under Armour Men's Camo 6" BoxerJock 2.0 Boxer Brief

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 Base 2.0 Long-Sleeve Crew Shirt

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

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

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