A Foldable Bike Helmet You'll Just Happen To Have In Your Bag : All Tech Considered : NPR
Collapsible bike helmet moonlights as a baseball cap
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Park and Diamond Is Launching a Collapsible Bike Helmet
Folding Bike Helmets: Are they safe? Practical?
The Newton-Rider N1 Bike Helmet Folds to Fit in Your Bag | WIRED
FEND One Foldable Bike Helmet | REI Co-op
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This Collapsible Bike Helmet Doesn't Welch On Safety To Save Space