The best sustainable footwear is no footwear. Don’t think this is not possible. There is a huge movement out there of people who walk barefoot all day. Barefoot is not without risks, but in general, it’s better for your feet.
However, many of us wear shoes all day. By custom, or because we have to.
Buying shoes is always a challenge. What to look out for? What’s best for my feet? Do the shoes also support the rest of my body? What to wear in which season?