The results were assembled using the Head Acceleration Response Metric (HARM), a formula that Biocore, the NFLPA's engineering consultants, and several other researchers helped develop. for measuring the severity of an impact and how that correlates to helmet safety and performance. On average, as the study found, the addition of a Guardian NXT was reduced HARM by 9 percent over control helmets with no caps; by comparison, its competition in the study, the ProTech—a modernized version of the ProCap—only reduced HARM by an average of 5 percent.
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