This mattress designed with 3 foam layers(memory foam layer, middle soft foam layer, and hard foam bottom layer). Material： Surface material: polyester fabric Inside: memory foam Made of hypoallergenic material to keep out dust mites, pollen, mold and pet dander. Size： Standard Double: 135cm (W) * 190cm (L) * 11cm (D) Due to manual measurement, a slight variation of 1-2cm may occur. Ideal for children and adults and it's suitable for most bed frames. Description： Experience superior comfort with triple-layer technology combining memory foam and supportive base foam. The 4cm foam layer contours to your body, relieving pressure on joints and spine for deeper, uninterrupted sleep. Temperature-sensitive materials and open-cell foam enhance airflow, preventing overheating throughout the night. The firm base layer provides durable support, preventing sagging and maintaining mattress shape for years. OEKO-TEX® certified fabric ensures safety for both children and adults, while hypoallergenic construction resists dust mites, mold, and allergens. Fully compliant with BS7177 UK/EU fire safety standards.