The biggest risk of not wearing socks is that you are more likely to acquire an athlete’s foot and other infections. There is no layer of material between your foot and your shoe when you wear shoes without socks to absorb moisture. As a result, your shoe becomes the ideal warm, dark, and wet environment for germs and fungus to grow.
Furthermore, even if you don’t have an infection, walking sockless with closed shoes may cause your feet and shoes to stink due to perspiration and bacteria buildup.