http://www.nytimes.com/2007/10/27/sports/football/27helmets.html?hp

Rather than being lined with rows of traditional foam or urethane, Ferrara’s helmet features 18 black, thermoplastic shock absorbers filled with air that — not unlike his squirt bottle — can accept a wide range of forces and still moderate the sudden jarring of the head that causes concussion. Moreover, laboratory tests have shown that the disks can withstand hundreds of impacts without any notable degradation in performance, a longtime drawback of helmets’ traditional foam.

Dr. Robert Cantu of Brigham and Women’s Hospital in Boston, one of the nation’s leading experts in concussion management, called it “the greatest advance in helmet design in at least 30 years.”

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