Taking midlayers to the next level in style, the Leader Graphene Insulator brings the classic styles of our midlayers together with graphene heat conduction technology, which distributes body heat evenly from warmer areas to colder areas in order to achieve a warmer overall equilibrium.This industry-leading technology, combined with 80g of PrimaLoft® Gold BIO insulation, will keep you toasty as a standalone piece or a warm layer under your favorite shell.