The atlas graphene half zip mid layer is an extremely comfortable garment to wear benefiting from graphene heat conduction technology moving heat from warmer areas to colder areas helping keep you warmer while simultaneously avoiding overheating. The discreet thumbholes assist in keeping the sleeve in place whilst layering up and act as additional warmth to the back of the hands. This garment is ideal as a stand alone mid layer or suitable to be worn in conjunction with other layers within the Graphene atlas layering system.