štikla

1. (usually plural) high heels; stilettos
   Na svadbu je obula nove štikle. — She put on new high heels for the wedding.
   Ne mogu ceo dan da hodam u štiklama. — I can't walk in heels all day.
2. high heel; stiletto heel
   Slomila mi se štikla na stepenicama. — My heel broke on the stairs.

A heel in general is potpetica; štikla is a high heel, typically but not necessarily a thin one.