• Rolling in speed: SPEEDROLL Technology propels you forward effortlessly, so you can run faster, not harder. Versatile energy return: Ultralight and springy PWRRUN PB cushioning and a flexible nylon plate gives you an edge for both speed workouts and races. Superior fit: Fine-tuned heel shape and updated slip laces for a locked-in feeling, mile after mile. Lighter Footprint: This style is vegan and contains recycled upper materials.