**REMOVABLE INSOLES** The GEL-CUMULUS® 23 running shoe is a recommended choice for neutral runners who want a soft and flexible everyday trainer with a great fit. This update features a one-piece mesh upper that's combined with a seamless 3D print construction to improve support and comfort around the foot. The FLYTEFOAM® technology in the midsole is softer than the previous version to promote a pillowy ride. Under the heel where the foot first hits the ground has been redesigned to isolate impact while the new heel design's deeper forefoot flex grooves and softer midsole foam create a smoother ride. Lastly, a hard-wearing AHAR® rubber outsole compound has been placed in key contact areas to help the GEL-CUMULUS® 23 shoe stand up to a ton of miles.