SPEEDROLL Technology and a powerful carbon-fiber plate propel you forward for effortless speed. A 39.5mm stack of PWRRUN PB foam meets World Athletics guidelines while giving you as much of an edge as possible. Geometry, plate, foam, and fit. We’ve mastered the formula for an unbeatable ride. Both have a lot of usage left under soles. Minor cosmetic wear around. Definitely nothing excessively abused.