Upper fits comfortably secure
Heavy, so best used as a training and recovery shoe
Contributing to that stiffness is a sole covered in a lot of rubber from heel to toe. On dry pavement, it delivers confident footing. Even on wet roads and gravel paths, the shoe held firm, with testers reporting that the rubber is durable and doesn’t show premature signs of wear.
Weight vs. Comfort
One knock on Boost in recent years has been the material’s weight. Made from thermoplastic polyurethane (TPU) pellets, it’s much heavier than the EVA foam used in running shoes for decades and even more so than the newer compounds hitting the market in high-caliber shoes. Of course, in its early days, the trade-off for the extra weight was worth it: You could run farther and feel less beat up for it. Along came newer materials like TPE and Pebax, however, which offer the same cushioning and springy ride but are lighter.