The Old Improbable Island Wiki

Otherwise known as Death on Wheels.¹⁾²⁾ They may only be worn with tight neon leggings and/or a nylon workout suit.³⁾

¹⁾

Four wheels, to be precise.

²⁾

Per foot, that is. Unless you have a strange pair of rollerblades. Could be 3 per foot though.

³⁾

Unless, of course, you're Batman, in which case your leggings may be black.