adidas Adizero Boston 12 Reviews

Even a full size down, the Boston 12 slid around and had a loose heel lock; the only fix was lacing so tight they got their first ever blister.

Loves the Boston 12; fixed its heel slip by adding a thin strip of foam in the Achilles gap and cured lace bite the same way under the tongue.

'The line is back': softer, more forgiving ride with a snappy toe-off, a good training partner for the Adios Pro 3 or a budget racer. All three struggled with the lacing and the very thin tongue; one tester felt forefoot toe pain that he tentatively linked to the rods.

Matt Klein, Nathan and David call it a major improvement over v10 and v11: softer, bouncier and lighter, and great for workouts and long rhythmic runs. They criticize the upper for poor midfoot lockdown on turns, scratchy mesh and thin heel padding. It is now a true neutral shoe and less stable than before.

Charles Rodmell found it fast and fun after adjusting to the pronounced toe spring, which took about five miles and worked his hamstrings more. It excels at tempos, fartleks and long reps, though the upper lacks lockdown for short fast reps. The outsole looked almost new at 91 miles.

A heavy novice training for a first half marathon is pleased with the Boston 12 after the first run; some heel rub that eases with good form.

After 100 miles, falling out of love with the Boston 12: fast but clunky, runs long, and the laces and tongue are annoying.

A 190 lb runner no longer likes the Boston 12: poor lockdown, firm deadness, and a calf strain in them.

Prefers the Boston 12 to the SC Trainer v3 for its cushioning and it felt great out of the box, but heel slip forces a tight heel lock that sometimes causes hot spots.

PR'd a 4-mile race in the Boston 12 but its stiff upper pinched their big toe joint and the laces caused heel slip; after cutting the upper and swapping laces it became their favourite shoe.