See more from this brand: Foldylock
This the world's first wearable folding lock - the clipster by seatylock.
Here is how Ilan came up with the foldylock:
"The concept of the folding lock was developed to join the benefits of two traditional locks - the "Chain lock" and the "U lock".
The Chain lock is very flexible and can lock the bike to a variety of objects, but its protection level is mostly low and it is bulky for riding. The U lock, on the other hand, is mostly ranked high on the protection scale, but because of the fixed shape it very inconvenient to use.
Folding locks, like a U lock, ranks high on the protection scale but with the flexibility of a Chain lock. It can also be folded into a small case while riding."