Men's NIKEA(R) METCON FLYKNIT 3 NOWSTALGIA :: The most comfortable Metcon so far kicks it old school with the special edition Men's Nike Metcon Flyknit 3 Nowstalgia training shoes. Delivering both style and the ultimate in flexible Flyknit breathability your Metcon Flyknit 3 Nowstalgia beasts were built to take on your toughest high-intensity intervals.