Yes it is! Natural Dust Mite Repellent Eiderdown is the soft, fine feathers of the eider duck, a large sea duck found in the colder regions of the Northern Hemisphere. The eider duck's feathers have a natural oil that repels dust mites, one of the most common allergens in bedding and clothing. This makes Eiderdown an excellent choice for those with dust mite allergies. Resistant to Bacteria and Fungi The natural oil in Eiderdown also makes it resistant to bacteria and fungi, common triggers for allergies and asthma. This means that Eiderdown outerwear is less likely to harbour allergens, keeping you comfortable and healthy throughout winter. Hypoallergenic Filling Many winter jackets and coats are filled with synthetic materials or down from other birds, which can trigger allergies in some people. Conversely, Eiderdown is a natural and hypoallergenic filling that is less likely to cause allergic reactions.