Method of forming a headrest assembly

A core part assembly, comprising:

• a hollow core part;
• first and second hollow supports extending from an interior of the hollow core part to an exterior of the hollow core part and each including:
• a first aperture disposed in the hollow core part;
• and
• a second aperture disposed outside of the hollow core part;
• and
• an outer shell coupled to the hollow core part, wherein the first hollow support, the hollow core part, and the second hollow support define a fluid path usable to route fluid into and out of the hollow core part.

A vehicle seating assembly, comprising:

• a hollow core part;
• a seatback;
• and
• a hollow support extending between the hollow core part and the seatback and including:
• a first aperture disposed in the hollow core part;
• and
• a second aperture disposed outside of the hollow core part, wherein the hollow core part includes a headrest bun, wherein the hollow support includes a strut configured to deliver a fluid into the hollow core part before an outer shell is molded around the hollow core part, and wherein the strut is configured to withdraw a fluid from the hollow core part after an outer shell is molded around the hollow core part.