Add a protective layer to your mattress with this anti-allergy topper that helps defend against dust mites and bacteria while you sleep. It's filled with specially treated fibres that create a barrier against allergens, and it's been approved by Allergy UK for added reassurance. The topper fits king size beds and adds 3cm of extra depth to your existing mattress. Elasticated corner straps keep it securely in place on mattresses up to 30cm deep, so it won't shift or bunch up during the night. The straps make fitting quick and straightforward, slipping over each corner to hold the topper firmly in position. It's machine washable and tumble dryer safe, which means keeping it fresh and clean is simple and convenient. The topper arrives vac-sealed for easier delivery, so just allow 24 hours after unwrapping for it to regain its full depth and shape. Whether you're managing allergies or protecting your mattress investment, this topper delivers practical function you'll rely on every single night. Suitable for king size beds. Size L200, W150, D3cm. Cover made from polyester. 100% Polypropylene reverse. Polyester filling. Fitted. Secured by elasticated corner straps. Anti-allergy. Anti-allergy. Cover is machine washable and suitable for tumble drying. Contains a biocide to help protect against bacteria and dust mite allergens. Active substance: Dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride.