RG> Vern you mention that if a helmets slides it will slide 
 RG> in the cover. I'm not sure what your trying to imply 
 RG> here? A hint please.
If you wear a hood over the helmet, collision friction will either pull the 
hood off the helmet, or simply be negated enough anyway.
Point being that the hood will likely slide around over the helmet. Or, for 
those with a jest for difference, the helmet will likely slide around under 
the hood. :)
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