Agglomerate comprising a first phase change material and a constituent having a density greater than 800 kgm3 and forming the core of said agglomerate. The instep is thinner along the grooves than along the ribs. The corrugated metal tube is provided with a straight tubular portion so as to extend for minimum 10 mm beyond the last and third swaged point which is located on an most opposite axial or longitudinal side of the socket fitting. A recombination suppression unit that suppresses a radiation mode of the microwave signal input to the signal input terminal from being recombined with the signal output terminal is provided on the connection substrate. The composition may be rinsed from the skin after it has remained on the skin for a period of time.