When it comes to winter travel, choosing the right jacket is essential for staying warm, as not all jackets provide the same level of insulation. There are several types of winter jackets, each categorized by their warmth levels. Down jackets, filled with goose or duck feathers, offer maximum warmth, making them perfect for extreme cold, but they can lose their insulating power when wet unless they have a waterproof layer. Fleece jackets, made from lightweight synthetic polyester, are great f