These Heated Liner gloves are built to slip inside your Hestra gloves to provide reliable heat throughout your day spent skiing or snowboarding. A rechargeable and replaceable battery power the integrated heating loops in each individual finger. Because of its electronic components this heated glove should only be worn with a shell that offers cover and protection. We recommend pairing it with the Army Leather Heli Ski gloves mitts and 3-finger gloves but it works well with many of Hestra's high-cuff styles with detachable liners.