No, I don’t mean the one-eyed giant from Greek mythology; that’s Cyclops.
I mean cycle-clips; made out of spring steel, usually coated in plastic, and they hold your pant leg at the bottom so they don’t get caught in your chain.
Very important if you ride a fixed gear bike as Fritz found out recently when his entire right pant leg was ripped from his leg.
Growing up in England, cycle-clips were standard equipment; as common in any household as a can-opener. If you owned any kind of bike you owned cycle-clips.
I don't understand why they never caught on the US.
Footnote: Cycle-Clips also can be used in the sport of Ferret Legging.