Phase Change Matters

U.S. patent application 20190133819 (inventor Andrew John Mason, Mono, Calif.):

"Described are various embodiments of a cooling pack. In one such embodiment a cooling pack is provided for cooling a crotch region of a human while seated on a seating surface, the cooling pack comprising a tapered container for holding a cooling material therein, and defined by tapering upper and lower surfaces drawing into a tapered edge to be positioned between the crotch region and the seating surface in use, thereby providing cooling for the region."

http://www.freepatentsonline.com/20190133819.pdf