With a generous layer of 100% pure Dunlopillo latex that is resilient, responsive and completely noise free, the Royal Sovereign Plus is the timeless classic of the Signature range but with the addition of an innovative, cooling mattress cover. This cover has been developed using highly conductive properties that work to cool your temperature by drawing heat away from your body. Premium mattress cover with Innovative Cooling Technology. Deep core made of breathable, responsive latex. 7 comfort zones. Pressure relieving. Reduced effort needed for movement throughout the night, resulting in improved REM sleep. Naturally anti-allergenic, anti-bacterial and anti-microbial. Completely noise free. Actipro Technology probiotic treatment: the natural solution to allergens, bacteria and odours. Maintenance free: no need to turn, flip or rotate. Medium support. Single - W: 90cm L: 190cm D: 21cm Small Double - W: 120cm L: 190cm D: 21cm Double - W: 135cm L: 190cm D: 21cm King - W: 150cm L: 200cm D: 21cm Super King - W: 180cm L: 200cm D: 21cm. 8 Year Guarantee - Signature Collection mattresses and bases. All claims under the guarantee should be made through the retailer where the bed was purchased. On Adjustable model purchases the remote control is guaranteed for 2 years.