As the Guardian Caps gained more exposure thanks to the NFL’s endorsement, increasing outside research helped shed more light on how they function. “I think it seems logical to most folks: If you cover your whole head in a massive pillow, maybe that’d help you more,” says Nicholas Cecchi, a colead author on a 2023 study at Stanford University that in part performed similar lab impact tests on a version of the Guardian XT as Biocore did with the NXT several years prior. “But there’s more to how it works that didn’t seem intuitive.”
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