The sock for the person who wants just a dash of wool the Lenz Heat Sock 4.1 Sock uses polyester and polyamid to create a sock that moves moisture quickly to keep your feet dry.. and pairs it with heating elements that wrap around your foot from your arch to your toes. Top and bottom, for maximum comfort no matter what you’re doing out in the cold. A sock designed to slide into a ski boot these are loved by snowboarders, winter hikers, and anyone who has to spend the early morning watching hockey practice in a freezing rink. One of the better inventions of the modern age, heated socks make winter a whole lot more fun, and are a game changer for anyone who has poor circulation and has considered abandoning sport to save their toes. These pair with either the Bluetooth compatible lithium pack rcB 1200 for smart phone control (with 14 hours of heat production), a particularly useful option if you want to adjust your heat depending on how active you are, or the conventional lithium pack rcB 1800 with its button changed three settings and 20 hours of heat production. A good choice if you are a “set it and forget it” type of user. Either way.. heated socks.. winter will never be the same again!