The Silentnight Mirapocket Premiere 2800 Pocket Luxury King Size Mattress features a 2800 advanced zoned Mirapocket spring system with sumptuous layers of luxury fillings. Modern micro quilted soft knit lid treated with Allergy UK approved Purotex probiotics to keep the mattress naturally dust mite free. Easy-care mattress, no need to turn. Mattress depth 33cm. Medium Firm.