I got some of these to replace the shoe-for-crews inserts in my work shoes. They're a little thick, so I had to rip out the sad remains of the inserts to make them fit, but it worked out. They take a little breaking in, since they are kind of stiff and the arch support is somewhat higher than I'm used to, but overall they are great if you work on your feet in a fast-paced environment or if you lead an athletic lifestyle.