Drying slippers in the dryer can lead to various issues. The heat and tumbling action of the dryer can cause the slippers to lose their shape, especially if they have padding or lining. Additionally, the dryer's heat might damage materials like rubber or faux fur commonly found in slippers. To preserve their integrity and avoid any potential damage from the dryer's heat and mechanical action, it is advisable to air-dry slippers. This ensures your slippers stay comfortable and in good condition for longer.