Halfdome Bike Helmet

Lead DesignerDan Harden
Prize(s)1st Place in Outdoor And Exercise Equipment / Sports/Toys/Games
Entry Description

“Halfdome” is an all-purpose bike helmet that folds in half so you can stuff it in a backpack. Two latches on the side of the helmet allow you to detach the top dome, turn it upside down, and drop it into the bottom ring. This reduces the helmet size by half in a matter of seconds. This is a true innovation because the instant volume reduction means that users can simply stuff it in a backpack, purse, or locker when not in use. It's no longer left on your bike to be rained on or stolen. The folded helmets are also stackable which allows a family of bikers to store and transport their helmets in a tiny space. The best part about Halfdome's design is that its practicality and convenience encourages more consistent helmet use (the big goal!).

Halfdome has a very innovative mechanical joint between the top dome and the bottom ring. The top dome and bottom ring both have a matching 45 degree edge which allow the dome to nest perfectly into the bottom ring. Two strong latches on both sides of the helmet lock the two halves together. The interlocking system combined with the two latches, provides a strong and reliable joint between the top dome and bottom ring, which is essential for the safety of the helmet. They are designed to withstand direct impacts from any angle including front, side, top and back. Once locked, it is secure. The latches are intuitive to use and obvious to notice if not completely latched.

In addition to the convenient size reduction feature, it was also important that Halfdome looks cool in order to encourage use, especially for kids. The two halves plus the latches offer all kinds of fun color and finish combinations.


Whipsaw is an Industrial Design & Engineering consulting firm located in San Jose and San Francisco, California. Whipsaw focuses on innovative product design, UX, development and branding. Whipsaw creates products and experiences across many diverse categories including consumer electronics, housewares, medical, wearables, computing, scientific, industrial, and business products. Whipsaw’s clients range from large corporations like Avaya, Bosch, Cisco, Clorox, Ford, GE, Google, Haier, Intel, Leitz, Merck, Motorola, Nike, Olympus, Samsung, Sony, and TP-Link plus exciting startups like Apnicure, Avinger, Highfive, Livescribe, OM Signal and Sprimo.

The Whipsaw team has created hundreds of successful products for its clients. Our market hits include the Google OnHub, the original Google Chromecast, Nike+ FuelBand, Dell Precision computers, Livescribe smartpens, Dropcam security cameras, Eton emergency radios, the Adiri baby bottle, Cisco/Linksys routers, Yubo lunch boxes, Intel healthcare tablets, the Kaleidescape Cinema One, Leapfrog LeapPads, Roku TV boxes, Topcon survey equipment, and TP-Link networking devices.

Whipsaw has won over 240 Industrial Design awards including many IDEA, Red Dot, iF, MDEA, G-Marks, CES Innovations, and D&AD awards.

Fast Company magazine ranked Whipsaw among the Top 5 design firms in the world and honored Whipsaw CEO Dan Harden as one of the 100 most creative people in business.

Whipsaw’s creations are in the permanent collection at the Cooper Hewitt Smithsonian Design Museum, the Chicago Athenaeum Museum of Architecture and Design, and the Pasadena Museum of California Art.