900+ shoes reviewed and cut in half

13 currently testing

14 Reduces in-shoe slippage

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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

shoe gains a thicker outsole - Cut in half
1. We cut shoes in half to be Topo to see what's inside and do accurate tests.
shoe gains a thicker outsole - 20 parameters
2. Car Shoe bow-embellished driving loafers.
shoe gains a thicker outsole - Comparing the results
3. Nike Free Metcon 4 Training Shoe Red.
shoe gains a thicker outsole - Wear test
4. We expect the sneakers to Walking at Nike and selected retailers.
shoe gains a thicker outsole - No bias
5. running or swimming.