Columbia Men Black Omni-Heat 3D Knit Half Zip II (Non Returnable)

Packed full of features, this baselayer provides supreme warmth & keeps you cozy in the harshest winter temperatures.
Designed with Omni-Heat 3D Reflective, it retains body heat while its 4-way stretch fabric keeps you comfortable.

Advance moisture-wicking courtesy of Omni-Wick technology & anti-microbial treatment allows you to change in & out of this baselayer for multiple days on a long trek.