There are a few reasons why you might need to buy a pillow protector. If you have a habit of tossing and turning all night, buying a protector can help prevent your pillow from getting stained or ruined. Additionally, if you have a partner who snores, buying a protector can help keep your pillow clean and free of stains. Finally, if you have allergies and are prone to getting hives from bedding, buying a protector can help avoid this by keeping the bedding away from your skin.