Experience unparalleled warmth with the California Heat 7SK-XL 7V Sock Liner XL, designed for outdoor enthusiasts who crave comfort in chilly conditions. These innovative sock liners utilize a rechargeable 7V lithium-ion battery to heat your feet within seconds, ensuring your toes stay toasty during all your favorite activities, from skiing to hiking. Enjoy a constant level of thermal comfort while you explore the great outdoors. Constructed from lightweight Lycra Spandex, these sock liners are both moisture-wicking and wind & water-resistant. The adjustable wide elastic band with a Velcro strap ensures a snug fit around your calves, allowing you to focus on your adventure without discomfort. The strategically placed heating elements wrap around your toes and underfoot, delivering maximum warmth where you need it most. The package includes everything you need for operation: a dual wall charger, a 60-inch Y-harness, and two 7.4V / 3500mAh rechargeable lithium-ion batteries, providing a combined heating time of 2-8 hours depending on the setting. With a maximum heat of 135?F, the California Heat 7SK-XL Sock Liner XL is your ultimate solution for cold weather comfort. Features: * Constructed of thin, lightweight Lycra Spandex * Moisture wicking plus wind & water resistant * Wide elastic band with Velcro strap for adjustable fit * Heating elements wrap around toes and underfoot * Includes a Y-harness for easy battery connection * Batteries provide 2-8 hours of heating time * Max heat temperature of 135?F * Package includes dual wall charger and essentials for operation