After 3 miles of running in low-cut socks, the tongue can damage the skin. The shoes are great, but the tongue design is an absolute must. If Altra sees this rating, please use it as constructive feedback. I don't want people turning away just because of bad articulation. The shoes are 90% great. I had to make two cuts on the tongue on the sides of the logo to allow the tongue to come out when the ankle was flexed. This adjustment has allowed me to walk with no tongue issues, but as a customer I am disappointed that I had to bump the shoe to wear it injury free.