Queen size, 12-inch mattress Thickness, spring mattress construction. Thickness 25 cm/10 inches. Provides e x cellent support for better spinal alignment. Warranty: 10 years Warranty (T and C refer to warranty card). FIRST KNIGHT-12IN Queen SPRING MATTRESS-High Density FOAM+SUPER X SPRING. Bedroom. Thickness 25 cm/10 inches. Provides excellent support for better spinal alignment. Built to last with a 10 years Warranty durability guarantee (T&C refer warranty card). Key details: Queen size, 12-inch mattress thickness, spring mattress construction. Thickness 25 cm/10 inches. Provides excellent support for better spinal alignment. Built to last with a 10 years Warranty durability guarantee (T&C refer warranty card). High Density foam provides supportive cushioning for lasting everyday comfort. Bring a more inviting sense of comfort to your Bedroom and create a space made for winding down at the end of the day.