It is a warm and comfortable top, specifically designed for hiking, skiing, and outdoor activities in cold weather. The zippered design allows you to flexibly adjust body temperature as needed, whether you need extra warmth or quick ventilation. The soft interior creates tiny air pockets. These air pockets provide exceptional warmth and insulation without feeling bulky. It is warmest fabric. As a classic all-season piece, it is suitable both as a warm mid-layer on cold days and for relaxing in a lodge