ASICS GEL-Cumulus gets an update to make it softer and more plush. ASICS added FF Blast foam to the midsole that gives it a soft, responsive ride.The new outsole of the GEL-Cumulus 24 is made of ASICS Lite and contains flex grooves to give you some flexibility at push off. This is a stronger and more durable material than standard outsoles.The tongue and heel are both padded to provide the ultimate in comfort and the tongue is semi-gusseted, so it stays in place throughout the run.