Most people like to wear sandals during the summer months. However, sandals do not typically provide good support for the feet. In addition, many types of sandals allow the feet to get very dirty, which can lead to problems. For example, the sandal straps can cause irritation, resulting in inflammation of the underlying tendon structures (Tendonitis). Sandal straps can also cause blisters, which may become infected.
If you wear sandals during the summer, I advise wearing them for short periods of time. Certainly avoid wearing sandals for 8–12 hours per day.