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.
Women's Baselayer Tops - Ramakko's Source For Adventure
Icebreaker Men's 200 Oasis Legging W/Fly - Ramakko's Source For Adventure
Women's UA Tactical ColdGear® Infrared Base Mock
Women's UA Base 3.0 Crew
Women's Intimates & Baselayers - Ramakko's Source For Adventure
Under Armour Outerwear Women's UA CGI Chutes Ins Pants, Bayou Blue (953)/True Ink, Large : Clothing, Shoes & Jewelry
UA Base 4.0 is a men's baselayer built for extreme cold weather and lower activity.
UNDER ARMOUR Under Armour Men's Coldgear 4.0 Crew
Under Armour Women's Coldgear 3.0 Bottom - Ramakko's Source For Adventure
Men's Baselayer Bottoms - Ramakko's Source For Adventure