The most popular of Lenz’s Lithium Packs, the rcB 1800 provides up to 20 hours of heat on a low setting, and has the juice you need to keep those toes warm even in the most single of the single digit mountain days. Heat control through push buttons on the battery pack or via your smartphone with Bluetooth, it’s quick and easy to give yourself an extra shot of heat on the lift, roll it back before you get so warm in there you’re starting to sweat. International charging, so you truly can go anywhere with your toes warm, and fast charging times, charge indicator lets you know when you’re holding a full charge and keeps you informed of the power levels during the day. A fantastic solution to the cold feet problem, you’ll find your Lenz ski socks are just as comfortable in your winter boots, opening up a whole range of winter possibilities. We’re sold on the flexibility of this system, and the lovely feeling of warm toes and the extra runs we can take with them.