Keep your hands warm and dry for hours with the Heated Core Hand Warmer. A lightweight li-ion battery heats up the low-profile carbon-fiber heating elements to give you constant, efficient heat. Choose from 3 heat settings to dial the warmth up or down to suit your needs. A zippered pocket holds the battery, plus has extra room for small essentials. An adjustable webbing strap holds the handwarmer comfortably around your waist. Or you can rotate it behind your back when it's not in use. A water-resistant outer shell keeps the fleece-lined inner chamber dry in any condition. Customize your heat with a touch of the button Heat adjustment button is located inside zippered pocket 3 heat settings: Red (hot), green (medium) and blue (low) Waterproof shell with 300-400mm moisture permeability Fleece-lined inner chamber Includes rechargeable battery and USB charging cable One size fits most