With another round of the Olympics coming up sporting companies need to find all kinds of new ways to get athletes to spend money on the latest and greatest equipment. Therefore obviously, Nike has stepped up with this PreCool Vest.
It is actually specifically created for the Beijing Olympics, and is meant for athletes in preparation for their respective sporting events. The little triangular cavities all house frozen water. You slip on the vest an hour before your competition and it lowers the body temperature of the athlete.
The vest makes the athlete last 21% longer than they normally would. It also acts as a thermos making sure that the cold doesn't escape.