I have a piece of Montana soapstone that I could shape into a brick for you. I'm sure you would be the only one on your block with a soapstone brick, and as you know, soapstone is famous for holding it's heat. It would certainly show those unwashed fly hurlers who was the bull of the woods. It would have them green with envy, until they found out you got food poisoning from leaving your burrito samich in a warm place for hours at a time. Maybe you'd better stick with trimmed cucumber sandwiches, like we truly elite anglers eat.