Peter,
Think of the egineering involved in the Hockey Helmet to be much like a stealth airplane.
By keeping away from square corners and flat surfaces they have made the helmet a "deflective" protector rather than just a cover to keep from being hit.
It is the same engineering that goes into "hard-shell" chest protectors. Again, it is designed to deflect from ANY angle rather than simply block the contact.
Tee
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