Poor circulation might sound like a minor issue, but for many, its the nemesis keeping them from full immersion in buttery back bowls. The Lenz Heat 5.1 Socks are the answer, delivering constant heat to maintain warmth circulation and throughout the day. The shin protector, compression tech, and moisture transfer material create a compact design thats made to help you keep up with your winter passions. Please note: battery packs are sold separately.