Indeed, Crocs are similar to barefoot shoes in some characteristics. They are lightweight and have a wide toe area, which has enough space for all the toes. But, like flip-flops, the heel is not fixed well enough in Crocs. Even if you lower the ankle strap. When walking in them, we also curl our toes (why this is not ok - we told you in the post About the Harm of Flip-Flops).

Well, since Crocs are spacious, during fast walking, due to poor fixation, the foot moves forward. The biomechanics of the step is disrupted + the risk of deformation of the nail on the big toe increases greatly (we rest it against the toe of the shoe).
And the sole of Crocs is not flexible (here (in this post we explain how this can affect your health).

By the way, did you know that some US schools have banned students from wearing Crocs for safety reasons?🤔