Flex Ultra-Firm Mattress: High-tension spring core provides ultra firm feel, resilient support to help maintain stable posture throughout the night. Premium Comfort Layers: Ultimate combination of innovative Firm e-Fibre comfort layer, and HD e-Fibre foundation layer offers a firm yet pressure-relieving sleep surface. Fresh Sleep Environment: To help keep you feeling fresh, the Flex is finished with a soft top layer breathable Advanced e-Fibre and deep quilted kitted fabric for a luxurious feel. Hypoallergenic, Odourless Materials: Breathable structure that encourages airflow and helps moisture evaporate, creating a less hospitable environment for dust mites and other microorganisms, reducing unpleasant odours and regulating temperature. 10-Year Manufacturer Guarantee: Made in the UK. 100% foam-free and OEKO-TEX certified, free from harmful chemicals with natural salt-based FR protection. Simply unbox, unroll, and allow it to expand. Plus side handles for easy movement. Size: Standard 4ft 6 Double (190 x 135 x 21cm)