Cycle World Magazine-November 2009-According to this article motorcycle helmets sold in the U.S. must meet federal motor safety 121, better known in the motorcycle world as "DOT." An independent certification organization, the Snell Memorial Foundation has had its own standard for years. Snells latest standard, M2010, goes into effect October 2009. The new Snell standard uses progressively heavier head forms (from 6.8 lbs. to 13.5 lbs.) in six shell sizes. What does this mean for you? Hopefully, according to the article, more energy-absorbent helmet liners optimize for specific shell sizes.
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