"Our most popular thin & firm mattress with medium-hard firmness will give you all the support you need. With its combination of foam and durable bonnell spring system, you'll feel cradled by the soft comfort layer on top, yet wake up pain free every morning with gentle spinal support. FEATURES AND SPECIFICATION Dimensions: W140cm x L200cm x ~D15cm Hardness: Medium Firm Bonnell coil sprung mattress 2 sided mattress - 2cm polyurethane foam on both sides Washable cover with zipper The zip cover might slightly differ from the photo. SOLID DESIGN Encased in a cover, the mattress comes equipped with a durable bonnell spring system that uses fibre fillings to provide superb comfort. The coil spring unit is topped with durable polyurethane foam on both sides."