‘Helei' is 'wife' in Ilithic. Helei leather is the name given to the result of any leather processed in one of the two main traditional ways of the Snow Clan of Elves (see also smoi leather). When the helei process is used, the resultant leather takes on a rigid, glassy appearance despite not losing any of the malleability expected in a leather. The name is a reference to the Snow Elf concept of ice being the symbolic wife of the Clan.
Both smoi and helei leathers are reputed to be particularly suited for wear in cold climates, insulating the wearer heavily even when only a thin layer of the leather is used in a garment's creation.