Expandable in-ear device

An expandable in-ear device, said in-ear device being implantable within an ear canal of an individual and being customizable in-situ to the shape of the ear canal using a settable compound, said in-ear device comprising:

• a core-form defining a nipple section, said nipple section being insertable into the ear canal,
• a sound bore extending through said nipple section from a position located outside the ear canal to a position located inside the ear canal for allowing sound transmission therethrough, and
• a deformable sheath attached integrally to said core-form, said deformable sheath being deformable between a sheath first configuration and a sheath second configuration wherein when said sheath is in said sheath first configuration said sheath extends generally away from said core-form while remaining attached to said core-form, said sheath being foldable inside-out from said sheath first configuration to said sheath second configuration wherein said sheath is in a generally overlying relationship relative to said core-form so as to substantially cover said core-form while defining a spacing between said sheath and said core-form, said spacing being fillable by the settable compound.