Abstract: An elongated, semi-flat tubular body constructed of flexible fluid impervious material is provided and the tubular body is divided into separate longitudinally spaced compartments along longitudinally spaced flexible transverse zones of the body. The compartments are filled with a fluid eutectic solution and the body may be folded along the transverse zones for relative angular displacement of the adjacent compartments. The elongated, semi-flat tubular body may removably supported within the channel defined by the sweat band of a hat or cap and may be used to absorb heat from the adjacent head areas of the wearer of the hat or to provide heat to those adjacent head areas.