The all-new Solstice Shirt eFire adds powered heat elements to the most versatile & comfortable women’s layering system for conquering any climate on Earth. Designed specifically for KLIM mid-layers and outerwear the Solstice Shirt eFire heated base layer traps body heat to ensure consistent warmth for a cold day on the snow. KLIM’s new eFire heated technology features one horizontal panel on the upper chest and two vertical panels on the upper back designed specifically for women. The heating element includes three heat modes – low medium and high – with long-lasting heating filaments powered by a USB-C charged battery and a dedicated battery pouch in a hidden zipper battery pocket.