The Humbgo XG Jacket's one of the FIRST to use Graphene in a heated coat. This breakthrough, ultra-thin material gives precise, even heat at 5x thinner than other heat tech. The shell is Teflon-coated to make it Windproof, Waterproof, Stainproof. Oh, and it's 100% Washable. I was super lucky to test it out. Makes me feel like I'm an Olympian!