That would be Fieldcraft Demimateria. Do you remember if it was I, II, or III?
http://xivdb.com/item/8148/Fieldcraft+Demimateria+I
http://xivdb.com/item/8149/Fieldcraft+Demimateria+II
http://xivdb.com/item/8150/Fieldcraft+Demimateria+III