Warming seat cushion for stadia
The principle of the thermal reaction of sodium acetate (snapping a small rod or a small metal plate causes the crystallisation process to start, giving off heat) is not a new one but now there is a seat cushion available for the 1st and 2nd halves. The cushion has two mutually separate chambers that can be activated independently. Of course, the cushion can also be used by ice hockey spectators, in which case the cushion has one chamber for each third.