I could see using them at night. As the surface temperature starts to slowing drop the warmers would provide consistantcy to some degree. I will have to try it soon. There is a track opening for night racing. I suppose since the air temps are now dropping rapidly at night the warmers would come in handy while the asphalt is still hot.
Hot Bodies | HPI Racing | HPI TV | Speedzone USA | Team Epic | Trinity | TRC