Winter hand warmers are a type of clothing accessory that is designed to keep hands warm during the cold winter months. The most common type of winter hand warmer is a MITTEN, which is a glove-like garment with a separate compartment for each finger and thumb. Mittens are usually made of wool or other insulating materials and are often lined with fur or fleece for extra warmth. They are an essential part of any winter wardrobe and can be found in a variety of colors and styles.