HeiQ Allergen Tech* This anti-allergy mattress protector 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. This mattress protector is designed to fit a deep mattress up to 36cm in depth and is held in place with an elasticated skirt fitting.