I’m pretty disappointed in the endorphin speed 4’s. I have been running in the endorphin shifts for three years, however since I’m unable to purchase them I decided I would try the speed 4’s based on the mostly positive reviews on here. I figured I just need to break the shoes in, but after a dozen or so runs, I can confidently say that the shoes are like planks - very flat, little cushion, and no roll. This is resulting in shin splints and pain. Not to mention the toe box is so much smaller than my previous shifts, it has resulted in rubbing. Have an expensive paper weight sitting here.
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