This comfort is a little surprising given the adjustment systems used on the Spiuk Z16R shoes. Both the ratchet system on the top of the shoes and the Atop dial below it allow you to tighten the shoes in very small increments, but don’t offer this level of precision when you want to loosen them, and you have to release them completely. This could be a problem in hot conditions where your feet expand, creating pressure points which can only be relived by loosening your shoes.