HeiQ Allergen Tech* This anti-allergy duvet is treated with HeiQ Allergen Tech*, an innovative and long-lasting treatment using naturally-derived probiotics to break down and diminish inanimate allergens such as dust mite matter, pet allergens (including hair and dander) and some types of pollen. HeiQ Allergen Tech* is a 100% biobased, proprietary technology which is certified to reduce the exposure to allergens, helping you to achieve a more peaceful night's sleep. Premium filling The premium filling creates an airy and open structure that traps heat, so it gives excellent insulation while being much lighter. This means you feel perfectly warm, without being weighed down and the 205 thread count, pure cotton cover is naturally breathable.