Swiffer Heavy Duty Duster Refills pick up 5X More dust and allergens. Heavy Duty Duster has Dust-Busting Strips to break down layers of built-up dust, and thousands of fluffy, Specially-Coated Fibers that grab onto dust in every direction and don't let go. 360 deg. design makes it easy to clean hard-to-reach places, like blinds and around knickknacks. vs. feather duster after 9 uses common inanimate allergens from cat and dog dander and dust mite matter.