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
Women's UA Base 4.0 Leggings
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Under Armour Men's ColdGear Base 4.0 Leggings
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
Under Armour Women's Base Legging 4.0 - Black
