In short, the Adizero Boston 12 is a fantastic, cushioned trainer platform let down by an awful tongue design. As a neutral trainer it excels, with responsive cushioning on a slightly rockered sole that encourages an efficient midfoot strike. Minimal lateral stability, but this is a road training shoe and the sole thickness is not ridiculous like some modern trainers. The toebox has a generous width to let the forefoot splay properly while the midfoot and heel are held securely. The big head scratcher is Adidas' decision to put the thinnest, most uncomfortable, lightweight racing tongue in a trainer. I can only wear my thickest socks with these shoes; otherwise it's immediate blisters where the tongue meets the top of the foot. No variation of alternate lacing could fix this. Adidas, I don't care if the shoe weighs another ounce because it's a trainer!
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