The perfect mattress enhancer if you want to add a medium layer of additional comfort to a firm or tired mattress. 4cm depth memory foam layer, simply moulds to your body. The Thermex zipped removable machine washable cover increases airflow and helps maintain ambient body temperature. Secured by elastic corner straps. This enhancer comes with a 3 year guarantee. Suitable for kingsize beds. Cover made from 100% polyester. 100% polyurethane filling. Cover is 30C machine washable.