The Medeco locks have a vertical row of six pins arranged like most pin tumbler locks. Unlike your average lock, the rotation of the pins is important. When the key is placed in the lock ...

(Video, embedded below.) Most common pin tumbler locks can be picked thanks to slightly loose fits of the pins and tiny manufacturing defects. By lifting or bumping the pins while putting tension ...

This has my vote for best wearable bike lock because it's a breeze to use, incredibly comfy to wear and let down only by its slightly inferior Sold Secure Silver rating ...