Yes, you are absolutely allowed to wear open-toed shoes, such as sandals or flip-flops, to Disneyland and Disney California Adventure. There is no park-wide policy prohibiting them. Many guests choose sandals for comfort in the California heat or to allow their feet to dry quickly after riding water attractions like Grizzly River Run. However, from a practical standpoint, most "Disney pros" advise against them for a full day of touring. You will likely walk between 8 and 12 miles (13–20 km) in a single day, and most sandals lack the arch support needed to prevent foot fatigue. Additionally, on attractions where your feet dangle (like Soarin' Around the World), you may be asked to remove loose-fitting flip-flops and place them in a storage bin to prevent them from falling. If you do choose open-toed shoes, ensure they have a secure backstrap to prevent them from slipping off in the dense crowds or on the more high-speed rides like Incredicoaster.