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UA Base 3.0 is built for very cold weather and moderate activity. It uses a unique pattern that’s designed to trap heat without adding bulk. Think long underwear revamped for today’s top athletes. UA Base 3.0 All Season Baselayer provides midweight warmth at many activity levels cold temperatures. UA Scent Control Technology to keep you undetected in all pursuits. Soft brushed grid interior traps air managing your body’s microclimate to keep you warm comfortable. Material wicks sweat dries really fast. 4-way stretch construction moves better in every direction. Integrated gaiter construction can be pulled over nose mouth for added coverage warmth. Built-in thumbholes help keep sleeves in place trap warmth.