There are some significant updates to Adidas’ venerable up-tempo trainer, the Adizero Boston 9. This is the first Boston to incorporate Adidas’ new Lightstrike foam, which is an EVA formulated to be very light and responsive. The combination of this foam with Adidas’ traditional Boost midsole material results in the lightest Boston yet, while not sacrificing any of the Boston’s vaunted energy return. This is a shoe that continues to display a penchant for quick running with a nice snappy toe-off. The other significant update to the Boston is the upper, which receives a dual-layer open mesh update that allows for more forefoot space to allow the toes to splay and the foot to move a bit more naturally. The Boston 9 remains a versatile shoe that can be worn for everyday running, workouts, and racing. One thing that remains from previous versions is the widely-admired Continental rubber outsole that puts Adidas at the forefront of traction technology — these shoes are grippy! If you are a Boston fan, these shoes will not disappoint — the updates improve an already fantastic shoe. If you are looking for an up-tempo shoe that can be used for just about everything, you need to try out the Boston 9.