ThruDark Siege Base Layer Sweatshirt

The battle-tested base layer, insulated and durable enough to be worn alone or as part of a layering system. Developed with Polartec® Power Grid, a geometric construction fabric that enhances moisture evaporation and supports temperature regulation. The grid design creates open air channels that improve breathability and reduce fabric mass. The high collar and integrated thumb loops provide increased protection in cold weather. When besieged by the cold, this first line of defense will fend off any attack.