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UA Base is a system of baselayers numbered from 2.0 C 4.0 that takes you from cold to absolutely freezing temps. It uses a special negative grid structure to trap heat without adding bulk. Think long underwear re-engineered for athletes performing at their peak. UA Base 4.0 is built for extreme cold weather and lower activity levels.This fitted top has Scent Control Technology to keep you undetected in all pursuits. It has soft brushed grid interior that traps air against your skin closely managing your body’s microclimate to keep you warm and comfortable.