Originally Posted by EivlEvo

As an official I can tell you that under the helmet listing there is nothing that makes it illegal HOWEVER...

Under Section 1N5 Jerseys
Which is a subcategory of "Riders Uniform"

It states: "No additional equipment, whether worn over or under a rider's uniform, which has the effect of reducing wind resistance is permitted, except in the case of inclement weather, additional covering designed solely to protect against precipitation or cold may be worn. However, shoe covers are permitted in any conditions."

This would be how this rule COULD be interpreted to make them illegal. As the CPSC certified the helmet in it's manufactured state, thus the addition of cardboard or what have you, could be deemed a safety risk and make the helmet non compliant. This is the same reason why it is "illegal" to glue a helmet back together after a crash... its certification is now null and void and thus illegal.

Also note that the helmet is considered part of the uniform.

Thoughts?