It's so cold I've got to get something to warm up my backside while I'm riding around the Sporting Clays course each week. I've got a top and I've just added front & rear windshields but I could use a seat heater that is only on when the engine is running. Has anyone heard of these? Same theory as a car seat heater but it would need to be waterproof. If anyone has done something similar, let me know. I really don't want to have a completely enclosed cab yet. Thanks!