PolyesterZipper closureIdear Winter Warmth Coat+Underwear shirt are appropriate for weather of around 50F. NOT DOWN, it is Down Alternative, Warmth, Soft and Washable).Skin friendly - Unique technology of high density synthetic and finer yarns to make down jacket extremely light and soft, breathable and very comfortable to wear.Wear at varies occasions such as business work, school, party, climbing, hiking, camping, skating, skiing, snowboarding and other outdoor activities in Fall and Winter.Skin friendly :These polyester-filled kids winter coats offer improved comfort when temperatures start to drop to keep your childs core warm and comfy.