Airsprung's Trizone spring unit provides extra support where it is most required, in your lumbar region. This is a framed spring unit combined with an insulator pad to eliminate spring feel, soft white polyester fillings and a Micro Quilted finish with additional layers. This mattress offers superb comfort and support. Flag stitch turning handles and quilted borders. Divan base comes in a quilted matching cover and a non slip lid so your mattress sits perfectly on top. With various storage options and castors for easy movement when required.