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I use a K1 that is about 5 years old. I've been hit square by foul balls at the HS level and never felt a thing. Bulk in of it self is not a "feature". The engineering design behind a chest protector is to quickly spread the point force of the ball over a much larger area thus significantly lowering the force you feel (This is the same concept used in bullet proof vests and they are barely noticeable under a shirt). If the point force of a baseball is one square inch, transferring that force over one square foot would reduce it by 144 times. It is not quite linear but you get my meaning.
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