The silentnight miracoil 7 luxury supercomfort double mattress features zoned continuous springs which provide targeted comfort support and pressure relief for all shapes and sizes as well as firmness for your hips softness for your shoulders and support for your lower back this double mattress offers medium firm support and is upholstered with a modern micro quilted cover in a luxurious soft knit fabric a good mattress choice if you suffer from allergies with anti allergy and anti microbia