The Invisible Bike Helmet: A Collar That Inflates Into an Airbag

Swedish women explain their creation

Two Swedish design students, Anna Haupt and Terese Alpin, decided to reinvent the bicycle helmet as an exam project, and the three-minute movie about their journey from initial concept to finished product—an "invisible" helmet, now available for about $600—covers a lot of ground without feeling like an info dump.

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