Nike's research laboratory has developed a vest to cool an athlete's body in less than five minutes, which tennis player Rafael Nadal has used in practice sessions during this year's US Open.
Nike Sport Research Lab's zip-up white vest features four large pouches ? two on the front and the back, inside which four "cooling packs" slot inside.

These are described by the brand as "capable of quickly reducing body temperature ? sometimes within only two to three minutes", much like a gel pouch that creates a cooling effect due to a chemical reaction.
Nadal and fellow professional tennis player Maria Sharapova wore prototypes of the garment earlier this week while practicing for the quarter finals of the US Open Tennis Championships, currently taking place in New York's Queens. Nadal tests cooling vest in New York heat
The city has experienced temperatures reaching highs of 95 degrees Fahrenheit (35 degrees Centigrade) and nearly 50 per cent humidity during the tournament, providing an ideal opportunity for the athletes to test the design.
"Anything that can help with this heat is a benefit," said Nadal in a statement. "We typically use wet towels to stay cool, but this vest gives me relief in all the places I need it."
"Every area of the vest was designed with players in mind," he added.

Nike Sport Research Lab started developing the garment for its NikeCourt tennis collection with a series of tests, measuring the correlation ...