Klim Aggressor eFire Shirt YCRF_parts_tracks By increasing the number and

By increasing the number and the frequency ventilation holes (there are more holes and they are bigger

Zippers: YKKzippers

Stretch mesh calf-sleeve for cooling and comfort

Featuring premium fine knit jersey material

and warm brushed cotton

Klim Aggressor eFire Shirt YCRF_parts_tracks By increasing the number andThe Aggressor eFire shirt adds powered heat elements to the most versatile and comfortable layering system available. Designed specifically for KLIM mid layers and outerwear, the Aggressor eFire heated base layer traps body heat to ensure consistent warmth for a cold day on the snow. KLIM's eFire heated technology features two vertical panels on the chest and one vertical panel on the upper back. The heating element includes three heat modes low,