This mattress is designed for a fresher, healthier sleep experience, plus it features our ultimate anti-bacterial treatment to help banish bacteria and dust mites. Pressure relieving memory foam originally designed for NASA, cleverly moulds to every contour of your body, delivering you restful and supportive sleep right through until morning. The Ecocell foam core has been developed to guarantee adaptable support reducing painful pressure points night after night. Silver fibres woven into the cover wick away moisture, whilst the Clean Effect treatment delivers anti-bacterial, anti-dust mite and anti-static protection. Enjoy a clean and comfortable sleeping environment keeping you fresh and cool all night long. Firmness: Medium. Delivered rolled - The mattress must be opened within 30 days of delivery. After opening, you mattress will regain its normal shape in 15 minutes and ready to sleep on after 6 to 8 hours.