Mattress Toppers. It's been generously filled with premium fluffy hollowfibre, finished with a soft and silky microfibre cover. The hollowfibre filling has been specially treated to have anti-allergy properties that are endorsed by the experts at Allergy UK – so you can sleep deeply in the knowledge you’re being protected from common household allergens such as dust mites, bacteria and fungus that can disrupt a quality night’s sleep.