Syphon sells flexible speakers. Our first product is a retro-fitable speaker unit that fits into motor sport helmets.
Listening to music while wearing a helmet is tough. Earbuds are uncomfortable and fall out, small outer speakers aren't loud enough to hear over the engine, and wires get in the way. Syphons speakers are so thin and flexible that you can't even feel them, produce high quality high frequency sound so you can hear your music over the roar of an engine, and connect via bluetoth so you don't have to worry about wires.