This is what I call a classic running shoe. In old parlance - a racer/trainer.
Let's start with the outer-sole - a combination of AHAR rubber in the heel for durability and Duo-sole in the forefoot (a combination of Dura sponge and Wet grip rubber ) that gives amazing traction on wet roads. The Flytefoam midsole is firm to encourage a smooth transition. There is a small gel insert in the heel for extra cushioning plus a slightly firmer medial post for stability....but it is so unobtrusive to be almost insignificant.
The traditional trusstic plastic stabiliser has been replaced by a firmer EVA mid-stance support facilitating smoother full ground contact at a lower weight.
The upper is the first Asics model with a knitted single piece seamless engineered mesh. The more densely knitted areas provide structure and support while the stretchy more elastic zones over the mid-foot and forefoot create a snug fit. Even the heel counter has been re-designed to reduce slippage.
So this racer/trainer has enough cushioning and support for everyday training but light enough to enhance performance in time trials, speed work or races. A great combo.