Which material is warmer for a jacket? Polyester, duckdown, wool etc?

I'm going to buy a jacket and I've come across several different materials and i was wondering which one will keep me the warmest. Price isn't a concern and the jacket will be used for going out in cold winter nights and to keep the rain off my back. So which material will keep me the warmest.... show more I'm going to buy a jacket and I've come across several different materials and i was wondering which one will keep me the warmest. Price isn't a concern and the jacket will be used for going out in cold winter nights and to keep the rain off my back. So which material will keep me the warmest. Polyester, duckdown, wool, goosedown, etc.
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