So the Hansons added an extra layer of padding to the XTs to create a beefier version, the 12-ounce Guardian NXT (with the N standing for NFL). It fared much better. For a 2021 article published in Annals of Biomedical Engineering, five authors—Bailey Good, two Biocore colleagues, and two other engineers who regularly consult for the NFL Players’ Association—subjected their crash dummy helmets to two main tests. The first involved hitting them with a pneumatic ram at speeds and points of impact that were determined in part through video review of concussion-causing plays among linemen during past NFL games. The second, for which the collision sites were picked to minimize face mask interaction and thus maximize helmet-on-helmet exposure, saw dummies with NXTs crash into each other with the aid of an electric belt-driven sled.
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