The Nike Spark Flyknit surfaces in this Grey, Green and Purple colorway. Design details include a Flyknit upper highlighted by the see-through windows at the side panels, a sock-like inner bootie and heel pull tabs. The sneaker’s most distinct feature is the brand new dual-density foam midsole with a hard plastic plated sandwiched between its layers. Swooshes on the side panels, toe and midsole, Nike Spark branded insoles and a translucent outsole round out the main features of the sneaker.