You can physically wear slippers to Disneyland, but in 2026, this is a high-risk choice for your physical comfort. Most experienced peers will strongly advise against it for several reasons. First, the average guest at Disneyland walks between 8 and 12 miles per day on hard concrete and asphalt; standard slippers lack the arch support and "shock absorption" required for this level of activity, leading to severe foot and back pain by midday. Second, "house" slippers often have smooth soles that become dangerous and slippery during the frequent California sprinkles or on water-based rides like Pirates of the Caribbean. Third, your feet are vulnerable to being stepped on in the dense crowds. If you prioritize "coziness," a high-value "pro" tip is to wear high-quality walking sneakers and bring a pair of "Disney-themed" slippers specifically for relaxing in your hotel room at the end of the day. If you must wear them in the park, ensure they are "outdoor-rated" versions with a rubber lug sole, but even then, your feet will likely pay a high "comfort tax" by the time the fireworks start.