Aviation professionals and frequent flyers strongly advise against taking your shoes off on a plane primarily for hygiene and safety reasons. From a hygiene perspective, cabin floors are rarely deep-cleaned between flights; they harbor a significant amount of bacteria, crumbs, and debris from hundreds of daily passengers. More alarmingly, the liquid you see on the floor of an airplane lavatory is almost certainly not water; walking into a bathroom in socks or barefoot is considered one of the most unsanitary things a passenger can do, as the moisture can soak through to your skin. From a safety standpoint, you should keep your shoes on during takeoff and landing—the most critical phases of flight—because in the event of an emergency evacuation, you may need to move quickly across a cabin floor or a runway that could be covered in sharp debris, hot surfaces, or spilled liquids. Losing precious seconds to find and put on your shoes could be life-threatening. If you must be comfortable, consider bringing "travel slippers" or a clean pair of compression socks, but never let your bare skin touch the floor of a commercial aircraft.