Having worn the last 4 pairs of unstructured running shoes over the past 7 years I figured they would be just as good. I couldn't be more wrong. The left boot relentlessly digs into my Achilles tendon (and only when driving). It just doesn't meet the same standard in terms of general or overall comfort as previous UnSheridan models. I'm a lifelong customer of Clark and I think this may be the first time I've been so disappointed. If anything changes over time I will update the review.