Northern Hunting Mens Bjorn Fleece UndershirtNorthern Hunting Mens Bjorn Fleece Undershirt Bjorn is a fleece undershirt with extreme thermal insulation and high breathability. The material is silent and flexible for extra comfort. The sweater is suitable all year round and ideal for the layer on layer principle, where the inner layer keeps you warm and dry on cold days. To see more from Northern Hunting, visit the Northern Hunting Collection