'Smoi' is 'husband' in Ilithic. Smoi 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. When the smoi process is used, the resultant leather takes on a frosty white sheen, regardless of the color it is dyed. The name is a reference to the Snow Elf concept of snow being the symbolic husband 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.