This is directed to a dome switch that may prevent liquid from coming into contact with circuit elements of the switch. A deformable dome may include a conductive inner surface region and may be placed over a conductive contact pad such that the dome may deform and the conductive elements may contact each other. At least one sheath may be positioned between the conductive region of the dome and the contact pad positioned below the dome for preventing liquid external to the one or more sheaths from contacting the conductive portions of the switch. In some embodiments, a first sheath may be coupled to the inner surface of the dome about the conductive inner surface region and a second sheath may be coupled to a mounting surface about the conductive contact pad, such that when a user deforms the dome, one of the sheaths may extend into the other sheath.