With half a billion wearable devices shipping in the next few years and going straight onto wrists, shoes, glasses and lapels, soon interacting with smart cities will seem as 'normal' as checking Facebook.

People prefer wearable devices that are unobtrusive, fit into daily life and existing habits, and look stylish. But even if all these boxes are ticked, do they really want to wear technology on their wrists, faces and around their necks?

Wearable tech startup MC10 works at the cross-section between health and technology. Partnering with Reebok, it has designed an 'invisible' head impact indicator that monitors sports players, feeding back vital data to their coaches.

Ray-Ban and Oakley sunglasses will soon join the wearable tech trend. Their maker Luxottica has reached an agreement with Google to design and develop eyewear based on Google Glass. Will fashion and iconic status make wearable tech a hit?