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The helmet should not slide down over their forehead, nor should it move significantly upward
Consult the Sizing Chart: Visit the website or contact the motorcycle helmet manufacturer you're interested in
The helmets were placed on a dummy's head equipped with accelerometers and other sensors
The eco, trail, and boost settings felt about right, but the e-mountain-bike level, which is meant to augment power based on terrain, never quite anticipated my needs
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