The Majestic Bedding Tiffany Bonnell innerspring unit has a 8 gauge tempered wire with extra support in the centre of the unit. The Jacquard ticking which is a sanitized, anti-mould, anti-mite treated fabric ensures for optimal hygiene of the mattress. The mattress consist of high density comfort layers using virgin foams for durability, and extra loft fibres and quilt foam for comfort. Double tempered edge support is added to reinforce the perimeter of the mattress and maximize the sleep area. Butterfly clips give extra support to the sides of the mattress, inhibiting sagging when you sit on the edge.