Abstract: There is disclosed a collar apparatus for retaining a hot or cold pack insert. The collar apparatus comprises an elongated integral planar member fabricated from elastomeric material and having an extensive central portion including a rectangular aperture dimensioned to accommodate the hot or cold pack insert. The central portion is coextensive with right and left ends, each of which has located thereon coacting retaining means to enable the planar member to encircle the neck of a user and a tubular stocking member adapted to cover the central portion when the aperture is accommodating said insert with said stocking member adapted to encircle and central portion of said elongated planar member.