The classic N1 deck jacket was first produced for the US Navy in the early 1940s. Much copied since then, it has become a true style icon in its own right. The Iron Heart version remains pretty true to the original jackets on the basis that "if it ain't broke, don't fix it". The one major, but unseen, change we have made is to add an additional interlining to increase wind resistance. This piece is a truly warm winter jacket.