This is my third pair of these shoes. They are exceptionally comfortable for paved or gravel road running. That being said, they are not really designed for rougher trail terrain, lacking a sturdy base or anything to provide needed stability internally in the shoe. They remain very plush in the heal and mid foot areas for extended mileage, while the fore foot does diminish somewhat. They are also perfect as a slip on running around town shoe. Very breathable and cool, but I use in temperatures in the single digits and snow with a warm sock adequately.