For those coldest of cold days, the Spitsbergen Hat is made of 100% lambswool with a wind-blocking WINDSTOPPER lined earband to keep you warm. Fabric: 100% lambswool, GORE INFINIUM with WINDSTOPPER 2L, 100% polyester ear band. Weight: 2.7 oz/76 g. Wicking. Breathable. Machine wash. Imported.