Fast-R Nitro Elite 3 vs Endorphin Elite 2

At 170g, the Fast-R Nitro Elite 3 is one of the lighter full-stack carbon racing shoes we track, and most reviewers rank it among the fastest they've raced in. The price of that speed is stability, durability and a ride that only makes sense when you're working hard. That makes it a very good running shoe for a fairly small group: efficient mid and forefoot strikers racing 5K to the half, and quick marathoners whose form doesn't fall apart late on. The Run Testers raced it at the London Marathon and felt it was lighter and more efficient than the Alphafly 3, though never a shoe they stopped noticing. Running Shoes Guru was less taken, marking it down for wobbliness and early wear at this price. At £260 RRP it sits at the top of the market, and Puma's own Deviate Nitro Elite 4 is £45 less if you want a carbon racer from the same range without the Fast-R's quirks.

Saucony swapped the firm foam of the first Elite for something far softer, and the Endorphin Elite 2 ended up as one of the bounciest carbon racing shoes around. Lab testing at RunRepeat rated its midsole the softest they had measured, and reviewers mostly describe a ride that squashes at easy pace and pushes back once you speed up. That makes it a marathon shoe before anything else, and it's also why it wobbles. The Run Testers found it unsettled on fast corners and slippy in the wet, and pointed to the Metaspeed Sky Paris as the steadier pick. The toe box is narrow as well. With steady mechanics and slim feet, you get a very lively half or full marathon shoe. If your form tends to fade late in a race, the Endorphin Pro 4 is calmer and cheaper, and Saucony has since followed it with the Endorphin Elite 3.