The Morpher folds in half from a full-size bike helmet so that it can be stashed away in a laptop or shoulder bag --€” something urban bike-share cyclists might find especially appealing. Courtesy of Morpher hide caption

itoggle caption Courtesy of Morpher

Cyclists negotiate rush hour traffic in central London on Nov. 15. Fourteen London cyclists have died so far this year, all in accidents involving heavy goods vehicles. Oli Scarff/Getty Images hide caption

itoggle caption Oli Scarff/Getty Images

No more helmet hair: Hovding's "invisible" helmet is an air bag tucked away in a collar that gets fastened around a cyclist's neck. It's aimed at urban cyclists and priced at $535. Courtesy of Hovding hide caption

itoggle caption Courtesy of Hovding