Overshirts are ideal for outdoor wear in cool weather. Norse Projects' Hjalmer is no exception, but it also helps protect the outdoors. The exterior is made from a lightweight Manteco wool blend, with two snap-close patch pockets on the chest, two welt hand warmer pockets, and a smooth polyester lining with an inner zip pocket. Between the layers is Thermore Ecodown insulation, which contains 100% recycled fibers from PET bottles, meaning that every jacket accounts for up to 10 bottles, keeping them out of landfills.