A hand-warmer is a device used to keep hands warm in cold weather. It can come in the form of a GLOVE, MITTEN, MUFF, or STOVE. A GLOVE is a garment covering the whole hand with separate sections for each finger and the thumb. A MITTEN is similar to a GLOVE but has no separate sections for the fingers. A MUFF is a tube of fabric filled with insulation material that is worn around the hands. A STOVE is a device that uses fuel to generate heat.