Nike has a brand new vest that aims to keep Olympians cool, thanks to the Nike PreCool Vest. This piece of clothing aims to lower the body’s core temperature, enabling muscles to perform more efficiently when the body is not dedicating resources to cool down. It is meant to be used up to an hour before a competition, claiming to let the athlete last up to 21% longer on the firled. The inner layer is filled with frozen water while the outer layer is coated with aluminum, making it essentially a thermos. Looks like an advert for a Nokia Prism ad if you ask me.