Sif's golden hair, which symbolized her connection to the fertility of the land and the harvest of grain, was often praised. She was known to be very vain about its beauty. According to legend, Loki, the mischievous trickster fire god, cut off Sif's hair while she slept (in one version, he burns it off). Thor was so angry that he forced Loki to replace Sif's hair with a wig, crafted by the dwarfs and made of the finest strands of gold.
Sif is thought by some authorities to be the equivalent of the Anglo-Saxon goddess Sib and the Teutonic Sippia.