Under Armour Women's 3.0 Base Layer Leggings
![](https://sportsheadquarters.ca/cdn/shop/products/16UARWWBS40LGGNGXAOA_Black_Glacier_Gray_is_9843208d-c287-4a50-afc8-089377fadbd5_1200x.jpg?v=1571281858)
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
Women's UA Base 2.0 Leggings
Women's Under Armour ColdGear 3.0 Base Layer Leggings
![](https://pyxis.nymag.com/v1/imgs/51b/941/8046f2f998dc154dea05529c64cdfa8922-Smartwool-Womens-Leggings.rhorizontal.w600.jpg)
The Best Base Layers, 2018: Merino Wool, Under Armour, More
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
Women's UA Base 3.0 Crew
Men's UA Base 3.0 Crew
![](https://m.media-amazon.com/images/I/510VcPb7iDL._AC_SX679_.jpg)
Under Armour Men's ColdGear® Base 4.0 ¼ Zip SM Black : Clothing, Shoes & Jewelry
![](https://terradrift.com//wp-content/uploads/2019/11/Screen-Shot-2019-11-26-at-3.29.00-PM-982x1024.png.webp)
5 Synthetic Base Layers - Base Layers Without Wool
It uses a special negative grid structure to trap heat without adding bulk. Think long underwear, reengineered for athletes performing at their peak.
![](https://i.ebayimg.com/images/g/a9gAAOSw7~Zdi5Xb/s-l1200.webp)
Under Armour Base 3.0 Legging Layer Women's 1343324-001 BLACK
Men's UA Base 4.0 Leggings