The Humbgo XG Jacket is one of the first ever jackets to apply Graphene to a heated coat. This breakthrough, ultra-thin material gives precise, even heat at 5x thinner than conventional coil heaters. br br The shell is made from materials used by mountain climbers, skiers, and winter sports athletes. It's Teflon-coated to make it Windproof, Waterproof, Stainproof.