The Silentnight Coral Memory 800 mattress features a miracoil spring system for support, alongside moulding memory foam to aid pressure relief. Allergy UK approved Purotex probiotics also help to reduce moisture and prevent against dust-mites for a breathable, healthier night\'s sleep. The Coral Memory 800 mattress is single-singled and no-turn for your ease - simply rotate from time to time. Miracoil Support - Our unique zoned Miracoil support system provides no roll together for less partner disturbance and zoned support where you need it most. Body moulding memory foam. Lyxurious soft knit cover for extra comfort. The mattress firmness rating is Medium/Firm but please note that this should be considered as a guide only. The firmness of your mattress is entirely a personal decision based on your comfort and support needs. 5 Year Guarantee Made in the UK Medium-Firm Mattress Single sided, no-turn Dimensions: Single W: 90cm L: 190cm D: 24cm Small Double W: 120cm L: 190cm D: 24cm Double W: 135cm L: 190cm D: 24cm King W: 150cm L: 200cm D: 24cm Super King W: 180cm L: 200cm D: 24cm