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

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

Save up to 50% on Guide Series Apparel

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 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 Treestand Base Top

Under Armour Men's Treestand Base Top

Key Features
  • 100% polyester, quick-drying, thermally insulated

  • ColdGear technology: warm, dry, and light

  • UA Scent Control suppresses odor-causing bacteria

  • Ergonomic seam placement

  • Fitted

$79.99
Under Armour Men's Base 4.0 Legging

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 - $94.99
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
Under Armour Men's Treestand Base Bottom

Under Armour Men's Treestand Base Bottom

Key Features
  • 100% polyester, quick-drying, thermally insulated

  • ColdGear technology: warm, dry, and light

  • UA Scent Control suppresses odor-causing bacteria

  • Ergonomic seam placement

  • Fitted

$79.99
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 2.0 Legging

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

$54.99 - $59.99
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

$54.99 - $59.99
Under Armour Men's Base 3.0 Legging

Under Armour Men's Base 3.0 Legging

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 - $84.99
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 - $84.99
Under Armour Men's HeatGear EVO Scent Control Long-Sleeve Tee

New! Under Armour Men's HeatGear EVO Scent Control Long-Sleeve ...

Key Features
  • Lightweight recycled polyester HeatGear fabric

  • Anti-pill, anti-pick finish for long-lasting wear

  • Signature Moisture Transport System wicks sweat

  • UA Scent Control technology keeps you fresher

  • Ergonomic flatlock seams for reduced chafing

$44.99 - $94.99
Under Armour Men's The Original 9" Boxerjock Boxer Briefs

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

$19.99 - $24.99
Under Armour Men's Ridge Reaper Boxerjock Boxer

New! 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 The Original 6" Boxerjock

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 - $24.99
Under Armour Men's EVO ColdGear Mock-Neck Shirt

Under Armour Men's EVO ColdGear Mock-Neck Shirt

Key Features
  • Fitted very close to the body

  • ArmourBlock odor-reduction technology

  • UPF 30+ sun protection rating

  • Two-layer brushed fabric

$49.99
Under Armour Long-Sleeve Mock With Capture Scent Technology

Under Armour Long-Sleeve Mock With Capture Scent Technology

Key Features
  • Nylour, PolyArmour, elastane

  • ColdGear double-knit fabric

  • Capture Scent Technology

  • Moisture-wicking properties

  • Compression fit

$74.99
Under Armour Men's EVO ColdGear Legging

Under Armour Men's EVO ColdGear Legging

Key Features
  • Fitted very close to the body

  • ArmourBlock odor-reduction technology

  • UPF 30+ sun protection rating

  • Two-layer brushed fabric

$49.99 - $64.99
Under Armour Men's Base 3.0 Legging

Under Armour Men's Base 3.0 Legging

Key Features
  • 7-oz. 93% polyester, 7% elastane w/4-way stretch

  • Base 3.0: max warmth for "extreme" cold conditions

  • ColdGear technology: warm, dry, and light

  • ArmourBlock anti-odor technology helps reduce BO

  • Ergonomic flatlock seams and performance waistband

$74.99 - $84.99
Under Armour Men's Base 2.0 Crew

Under Armour Men's Base 2.0 Crew

Key Features
  • 4.9-oz. 93% polyester, 7% elastane w/4-way stretch

  • Base 2.0: highly versatile for "cold" conditions

  • ColdGear technology: warm, dry, and light

  • ArmourBlock anti-odor technology helps reduce odor

  • Ergonomic flatlock seams and raglan sleeves

$54.99 - $64.99
Under Armour Men's Base 3.0 Crew

Under Armour Men's Base 3.0 Crew

Key Features
  • 7-oz. 93% polyester, 7% elastane w/4-way stretch

  • Base 3.0: max warmth for "extreme" cold conditions

  • ColdGear technology: warm, dry, and light

  • ArmourBlock anti-odor technology helps reduce BO

  • Ergonomic flatlock seams and raglan sleeves

$74.99 - $84.99

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