This high-quality mattress is made with the traditional Bonnell open coil spring system using thick 13.5 gauge metal springs for durability. The spring system is encapsulated in layers of high-density foam to ensure comfort and support for your body. This mattress is a medium rating for firmness with a bit of bounce!. Note: As our mattresses are vacuum rolled, we advise 72 hours for the mattress to inflate to its full depth. Our mattress has a soft quilted cover to provide a flatter more comfortable sleeping surface as opposed to tufted covers, which may look posh but can get uncomfortable. The mattress cover is made from breathable knitted fabric to promote air circulation for a more comfortable night's sleep. It benefits from being fully sanitised with hypo-allergenic & anti-dust mite properties. The cover has stitched bound border support - support all the way to the edge! 23cm / 9"" Deep Traditional open coil spring system Top layer of high density support foam Stitched bound