In particular, Cecchi, who was a PhD student in bioengineering at the time of the study, cites the “sliding” effect produced by the Guardian Caps’ design. “It really did seem like their main effectiveness was coming from the reduced surface friction on the exterior, and then also the decoupling of different layers,” he says. In other words, the Guardian Cap isn’t just a hat on a hat; the two-part, add-on system has its benefits.
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