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6 Base Layers From Under Armour For the Outdoor Runner
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ColdGear® Base 4.0 Crew

Consider this the warmest base yet. The ColdGear® Base 4.0 Crew ($80) has a distinctive fabric pattern to trap heat without creating extra bulk.

ColdGear® Base 4.0 Crew
ColdGear® Base 4.0 Crew
$80
from underarmour.com
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