Adizero Boston 13 vs Adizero EVO SL 1

Adidas left the Boston 13's ride close to version 12 and put most of the update into comfort, with a padded heel and tongue and a new mesh upper. There's also more Lightstrike Pro sitting above the stiff carbon-infused rods. It's still a firm tempo shoe that's happiest once the pace picks up, and at £140 it's a cheaper way into rod-assisted speed than a proper carbon racing shoe. Its biggest rival is another adidas. Ben Parkes and Fordy Runs both liked the Boston 13, and both reckoned most runners would have more fun in the lighter, softer Adizero Evo SL. The Boston's argument is durability and a steadier platform, so we'd point it at runners who want one hard-wearing pair for workouts and marathon-block long runs. If you already own a Boston 12 you get on with, the changes are small.

Few running shoes of the last couple of years got talked about as much as the EVO SL, and the reason is simple. adidas took the Lightstrike Pro foam from its race shoes, left out the carbon rods, and sold it at a daily-trainer price. At 224g with a 39mm heel, it's a light, bouncy tempo shoe that reviewers keep calling a bargain.

It shines when you pick up the pace. Tempo runs, intervals and goal-pace work are its home, and plenty of runners race half marathons in it. It's less happy at a slow shuffle, and it isn't a stable shoe, so it won't suit everyone as a do-everything trainer.

If you want a plate for race day, the Adios Pro 5 is the step up. As an unplated speed trainer, though, this is the one others in the category get measured against, and the few flaws people mention (laces, tongue, some early outsole wear) are small ones.