The next pair, with more criteria.

A single model tells no story. 108 do. Every number in this section is counted from the base itself at the moment the page is generated, so it cannot diverge from the table above: if a model enters or leaves tomorrow, the text changes with it.

Between 2016 and today, the running shoe went through a real change, not a marketing one. It is worth understanding its size, because that is what separates what deserves your money from what is just advertising.

The effect exists and was measured. In 2018, a study published in Sports Medicine had runners train in the prototype that would become the Vaporfly and in two popular running shoes of the time. The energy cost of running at the same pace dropped 4.16% and 4.01%, depending on the comparison shoe. In 2019, with the model already on sale and high-level runners, running economy improved between 2.6% and 4.2%, also according to the shoe used in the comparison. A 2025 meta-analysis pooled the available studies and confirmed the effect, classifying it as small to moderate: metabolic cost dropped, on average, 0.38 watt per kilogram of body weight.

Translating: the shoe does not make you faster, it makes you spend less to go at the same speed. If you run 10 km in 50 minutes, a few percent of economy can become some time on the watch, but the effect is proportional to pace. Those who run slowly benefit less, because the plate and the foam were designed for the mechanics of someone running fast. That is why the same technology that transformed world records disappoints so many people on the Sunday run.

And there is a legal ceiling. World Athletics limits midsole thickness to 40 mm in road races and 20 mm on the track, values in force since November 2024. Trail and mountain have no limit. That is why so many race models stop exactly at 39 or 40 mm: it is the maximum allowed, and the brands went right up to the line.

1. Having more than one pair helps, and that was measured. A follow-up of 264 runners over 22 weeks found fewer injuries among those alternating more than one model in the period, compared to those always using the same one. The caveat: it is an observational study, not a controlled trial, so it shows association and does not prove cause. Even so, it is one of the few things with evidence in its favor, and the cost of testing is low if you were going to buy a second pair anyway.

2. Drop has no single answer, and your experience inverts the sign. A study that randomized runners among 10, 6 and 0 mm drops found no overall injury difference between them. But when the researchers split by experience, the result inverted: among occasional runners, the low drop was protective; among regular runners, the low drop increased the risk. The practical reading is boring and true: if you have been running on a drop for a long time, changing has a cost. Change slowly, if you change at all.

3. Soft or firm depends on your weight. Another randomized study compared soft and firm midsoles. Overall, the firm one was associated with more injury. But the effect only appeared consistently among the lightest runners; in the heavier ones, the difference did not hold. In other words, "the softer the better" is not law, and the same midsole does not mean the same thing for two different bodies.

4. Stability shoes have evidence, with an asterisk. A trial with 372 runners found fewer injuries with motion control footwear, with the effect concentrated in those with a pronated foot, and no effect on neutral or supinated feet. A later reanalysis showed the protection appears precisely in pronation-related injuries. The asterisk: the evidence comes essentially from a single research group, which limits generalization.

5. The "500 to 800 km" rule for replacing shoes does not come from an injury study. This is worth saying in full, because the phrase is repeated as if it were science. What exists is a 1985 mechanical test that measured cushioning loss with use: about 75% of the original cushioning remained around 80 km, and less than 60% between 400 and 800 km on a machine, although in shoes from real runners about 70% still remained at 800 km. No study linked a specific mileage to more injury. In practice, replace when the shoe changes behavior, when the outsole wears unevenly or when discomfort appears, and not because a round number won.

The specs of each model are linked inside the comparison, one by one. The scientific claims in the text come from the references below, all checked in the original abstract or in the official document. No number on this page was written from memory.

• Hoogkamer W et al. A Comparison of the Energetic Cost of Running in Marathon Racing Shoes. Sports Med. 2018;48(4):1009-19.
• Barnes KR, Kilding AE. A Randomized Crossover Study Investigating the Running Economy of Highly-Trained Male and Female Distance Runners in Marathon Racing Shoes. Sports Med. 2019;49(2):331-42.
• Kobayashi EN et al. Metanalise sobre calcado com placa de carbono e economia de corrida. Front Sports Act Living. 2025;7:1710224.
• Malisoux L et al. Can parallel use of different running shoes decrease running-related injury risk? Scand J Med Sci Sports. 2015;25(1):110-5.
• Malisoux L et al. Influence of the Heel-to-Toe Drop of Standard Cushioned Running Shoes on Injury Risk. Am J Sports Med. 2016;44(11):2933-40.
• Malisoux L et al. Influence of Midsole Hardness of Standard Cushioned Shoes on Running-Related Injury Risk. Am J Sports Med. 2020;48(2):473-80.
• Malisoux L et al. Injury risk in runners using standard or motion control shoes. Br J Sports Med. 2016;50(8):481-7.
• World Athletics. Athletic Shoe Regulations, Book C - C2.1A, Apendice 2 (efetivo 01/01/2026).
• Cook SD, Kester MA, Brunet ME. Shock absorption characteristics of running shoes. Am J Sports Med. 1985;13(4):248-53.