700+ shoes reviewed and cut in half

24 currently testing

32 bought and to be tested

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We go down the rabbit hole when it comes to running shoe technologies, features, and lab tests. See all our in-depth guides.

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Testing process

The lateral side of the Puma Fi Trainer - Cut in half
1. We cut shoes in half to be able to see what's inside and do accurate tests.
The lateral side of the Puma Fi Trainer - 20 parameters
2. In our lab, we measure and assess over 20 parameters for each shoe.
The lateral side of the Puma Fi Trainer - Comparing the results
3. Our tests are standardized, and our results are comparable.
The lateral side of the Puma Fi Trainer - Wear test
4. puma r78 og mens sneakers in greyvioletwhite.
The lateral side of the Puma Fi Trainer - No bias
5. No bias: we buy all the shoes on our own and accept no sponsorships.