Hi! OROS Apparel team here :)<p>The aerogel in the gloves is coated on one side with pure graphene. Graphene is the exact opposite of aerogel. While aerogel has an incredibly low thermal conductivity (making it an awesome insulator), pure graphene has an incredibly high thermal conductivity (making it a great conductor). Most metals act the same way as graphene (they have high thermal conductivities)-- think about the last time you got in your car on a hot summer day and went to put your seatbelt on. You accidentally touched the metal part of the seatbelt and immediately regretted your decision. It was hot. Metals, like graphene, pick up heat in the presence of heat (hence high thermal conductivity). So, imagine the graphene coated side of the aerogel is facing your hand. Your hand releases heat. The heat gets picked up by the graphene. The graphene heats up. The heat does not easily escape, because on the other side of the graphene is aerogel (an insulator). You now have, essentially, a self heating glove without a battery.