UA Base is a system of baselayers, numbered from 2.0 – 4.0, that takes you from cold to absolutely freezing temps. It uses a special negative grid
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UA Base 4.0 is built for extreme cold weather and lower activity. It uses a unique pattern that's designed to trap heat without adding bulk. Think
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Under Armour UA Base™ 4.0 XXX-Large Black : Clothing, Shoes & Jewelry
UNDER ARMOR BASE 4.0 LEGGING, BLACK