These aren’t your grandpa's long underwear. The unique negative grid traps monster warmth without adding weight and it’s smooth on the outside to let you layer. UA Base™ 2.0 is the most versatile of the UA Base™ thermals, built for basically anything you do outside.
UA Base™ 2.0 is highly versatile mid-weight protection for colder conditions and a variety of activity levels
Soft, brushed negative grid interior traps hot air, providing superior warmth
4-Way Stretch fabrication allows greater mobility and maintains shape