At least 50% wool but the higher the warmer. The best winter coats I have ever bought have been a long brown wool overcoat by Superdry Cult Studios and a double breasted belted black one by Weekday. You can wear literally anything with it because no one can really see and you can experiment with fun cuffs and collars underneath to really make a great outfit. Also wearing a suit under an overcoat is the most power dressing feeling ever. They are so chic and also practical.
