UA Base 4.0: Mega-grid thermal fleece for the ultimate warmth in the brutal coldThermal grid fabric traps heat in tiny pockets for long-lasting protection. Quick-dry construction wicks moisture to keep you drier, lighter, an...

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UA Base 4.0: Mega-grid thermal fleece for the ultimate warmth in the brutal coldThermal grid fabric traps heat in tiny pockets for long-lasting protection. Quick-dry construction wicks moisture to keep you drier, lighter, and more comfortable. Lightweight, 4-way stretch construction improves mobility and maintains shape. Raglan sleeves and flatlock seams unlock mobility and eliminate chafing. Thumbholes keep sleeves secure and help seal in your body heat.

  • UA Base 4.0: Made for the most brutal cold around & low activity levels
  • Thermal grid fabric traps heat in tiny pockets for long-lasting protection
  • Quick-dry construction wicks moisture to keep you drier, lighter, and more comfortable
  • Lightweight, 4-way stretch construction improves mobility and maintains shape
  • Anti-microbial technology fights odors to keep your gear fresher, longer

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