Boost is the miracle midsole foam that has left all other shoe companies playing catch-up since 2013. It’s luxuriously soft when your foot lands, and it has a firm snap on toe-off. For the Adidas shoe engineers charged with designing the best road running shoes, 2018 is still under the sign of Boost. For their flagship neutral trainer, they’ve added Boost. Lots and lots of Boost. Which adds up to highly responsive cushioning and amazing comfort (admittedly, at a price that might raise your heartbeat to levels usually seen at the end of a 5K).