Nike's PreCool technology was first introduced in the 2004 Athens Olympics.
Four years later, it is lighter, more flexible, better fitting - and refillable.
Designed to cool the body's core temperature, the PreCool vest is composed of a grid of triangles, each of which is made of two austin dwi layers: an inner layer of ice and an outer insulating layer. Coated with aluminium, the triangles also reflect radiant heat away.
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