Details from ASICS website: The GEL-NIMBUS® 25 shoe's soft cushioning properties help you feel like you're landing on clouds. This neutral trainer is revamped with new materials that create a softer and smoother running experience. A soft knit upper comfortably wraps your foot while supplying advanced ventilation. Its updated knit tongue construction provides better flexibility and extends around the ankle for a more luxurious fit and feel. The midsole is packed with the most cushioning that the series has offered to date. By adding more FF BLAST™ PLUS ECO cushioning and using our new PureGEL™ technology, this trainer creates a lighter and softer cushioning experience.