Worried that Superman might tear your lock off and nick your push bike, fear not with the Kryptonite bike chain (sleeve).
Kryptonite New York Chain with EV Disc Lock and custom JACK SPADE nylon procective cover silkscreened with a topographic map grapic. The Kryptonite New York Chain comes with a lifetime key registration and limited lifetime warranty. Replacement keys available.
Available from Jack Spade (cover $25 or including chain for $144), found via aquire.