The juice pack virtually doubles the battery life of the iPhone and its soft touch hardware also provides protection from device bumps, bangs and drops.
Perhaps in another 50 years, the fixed hardware inside today's electronic devices will look just as old-fashioned and hardware will have gone soft too.
While it looks like it'd be heavy and hefty to wear, the device is very comfortable to wear for short periods of time and the ear cups are extra soft to avoid that pinned-back feeling you get with heavier hardware.