We couldnt pick a favorite natural material so we used them all to make one of our warmest winter coats. Made of 100% organic cotton wide-wale corduroy exterior, lined with our classic 100% organic cotton fjord flannel and insulated with 600-fill-power 100% Recycled Down (duck and goose down reclaimed from down products) in large, wide, warm baffles in heritage-inspired styling. Fair Trade Certified sewn