[Note]After referencing some feedback from some of our customers, we suggest going up a size for a more suitable or referring to the size chart before ordering. HEAT MANAGEMENT: Our down jacket is lined with metallic lining which is a heat management system for outdoor performance. It can reflect body-generated heat while dissipating excess heat and speed the passage of moisture vapor away from the skin which provides you the long-time comfort. ADVANCED DOWN COMFORT: The CAMEL CROWN down jacket features a water and stain-repellent nylon shell,combined with 75% of duck down insulation and lined with our thermal heat reflective interior-all adding up to a lightweight and super warm jacket. LIGHTWEIGHT AND PACKABLE: A 350g of jacket can be packed down into its own interior pocket which is lighter than a 330ml bottle of water that you can stow it anywhere you want. This jacket provides warmth without any bulkiness. HANDY FEATURES: This packable down-filled jacket features two zippered hand pockets, an interior security pocket, binding at cuffs, and a drawcord adjustable hem for controllable warmth. down jacket