dude have you ever seen anything slide across pavement with out skipping and bouncing? the foam in your helmet is designed to slow impacts by breaking down and slowing your head... but it can only do this once as it doesn't "rebound" like other foam... even if it's just slightly indented (the indent may be between the shell and the foam and not your head and the foam) it's not going to perform at 100% it's your head... but I'd never trust that if I wreck I'll probably need less than 100% of the helmets capabilities...
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