With 3 heat settings at the touch of a button, the Seirus Heattouch Atlas Mitten pumps out serious heat on command. The flexible softshell sheds moisture and wraps around 240g Heattlock insulation for a mix of mobility and warmth. But it's the Flexible Fusion heat panel that sticks out for us with its heated wires wrapping around the back of our hands, fingertips, and thumbs for battery-powered active heat. The wafer-thin battery can power 6+ hours of low heat, 4+ hours of medium heat, and 2+ hours of high heat to warm our hands up run after run after run.