Husband wore the them for long days on concrete and other surfaces. Shoes were incredibly uncomfortable. Insert is a puny piece of material, no cushion. Felt like walking directly on whatever surface he was on. Killed the balls of his feet even after he put new cushioning insole in. Treads on bottom began to wear considerably and to top it off, the sole began to separate from the shoe after two months. Keen was great about fulfilling their warranty and he ended up choosing a different model as a replacement.