In a world of incredibly light 10-ounce soccer shoes, one of these weighs 5.8 ounces. The Adidas F50 Adizero is the latest in a string of sports innovations to debut at the World Cup soccer championship, this one on the feet of Argentine player Lionel Messi. A lot of that weight was shed by removing the insole and strengthening the outer part of the shoe. That’s complimented by the ultra-light carbon fiber upper, and plastic tech borrowed from another sport where lightness can make a big difference: cycle racing. If it weren’t for that mild-mannered Carolina blue color, I wouldn’t [...]

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