If you thought Nike’s featherweight running sneakers were light, just wait til you hear about their latest innovation, Flyknit. Flyknit is a sophisticated construction that gets rid of the excess to create a shoe thats incredibly light with a seamless, streamlined, one layer upper. In fact, their Flyknit Racer model will weigh in at just 5.6 oz for a size 9, which is almost as light as an iPhone 4S. For everyday running Nike will also release the Nike Flyknit Trainer which weighs 7.7 ounces. Both models wi