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Well,
The research is based on the same concept of F1 race cars.
The elimination of energy during a crash is based on the car releasing parts quickly and easily (with the exception of the protective cage).
If the mask is worn loose the energy is released freely and the mask either returns to the original place, spins around the head or flies completely off.
MLB sent an internal memo to all umpires mid-way through 2010 (after there were two concussions) instructing umpires how mask tightness was an important deterent to injury.
T
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