We gear up with the Lenz 5. 1 Heat Sock to keep numb toes at bay on the mountain's chilliest days. This sock features a flat heating system integrated into a mix of high-performing materials for up to 14 hours of all-around warmth. The low-profile, rechargeable battery pack snaps right in and out of the sock cuff and can be controlled directly or from the Lenz heat app on our phone to adjust the temperature.
