I wonder what material was used for the upper rf ear platform? Being stunt helmets could it have been rubber or plastic since the helmets would be abused? On Stunt #1 the lower ear is sponge or something, so could the upper ear on Stunt #1 be rubber, plastic etc.? On Stunt #2 could the whole rf side ears parts be rubber, plastic, etc.? If so, then the question is: would the hump even be there (on the helmet), or would the rf ear paltform have been all one piece separate from the helmet altogether meaning the helmet had no hump?
Has anyone touched the stunt ears or know what they were made of?