Nike has unveiled the PreCool Vest, developed specially for the Bejing Olympics, the vest inspired by a1960s mini dress and medical packaging. Each triangle is made of two layers to keep it cool. The inner one is filled with water, which is frozen, while the outer layer insulates like a thermos. Coated with aluminum, the triangles also reflect radiant heat working like the coating on mirrored sunglasses. That coating and insulated layer also mean less ice. It can help the athletes last 21% longer out in the field. Unfortunately, the PreCool is only available for Olympic athletes.

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