Got these for free and decided to test them out. They say there is a "New FluidRide" midsole. Guidance Trusstic helps enhance gait efficiency and midfoot structural integrity. I don't notice anything, but maybe that is the shoe doing what it should do. Gel cushioning in the rearfoot and forefoot is definitely a nice touch, makes for a smoother run on the pavement. The mesh upper makes for a comfortable fit and easy movement while you run.