Special Edition Nike Metcon 4 XD Whiteboard. Full tread gum soles. Original insoles. In like new condition. Excellent training shoes. The Nike Metcon 4 XD Shoe features an updated upper with a zonally placed haptic print for enhanced durability andstability. Flywire technology provides you with a locked-down fit, while the sticky rubber in the forefoot provides excellent traction for running and training.