FEND | The Foldable Bicycle Helmet by FEND — Kickstarter
Park and Diamond's bike helmet folds down to water-bottle size
Folding Bike Helmets: Are they safe? Practical?
Folding Bike Helmets : bike helmet
This Clever Bike Helmet Collapses to Fit in Your Backpack | WIRED
Amazon.com : Closca Helmet Loop. Foldable Bike Helmet for Adults. Bicycle, Skateboard and Scooter Helmet. Award-Winning Helmet Design for Urban Cycling for Men and Women. : Sports & Outdoors
CLOSCA Helmet Loop: Priority Bicycles Exclusive - 50% off