Single size, 6-inch mattress Thickness, spring mattress construction. Thickness 15 cm/6 inches. Medium Firm. Warranty: 10 years Warranty (T and C refer to warranty card). KINGKOIL-6IN Single SPRING MATTRESS-High Resilience Foam FOAM+CHIROPRACTIC COIL. Bedroom. Thickness 15 cm/6 inches. Medium Firm. Built to last with a 10 years Warranty durability guarantee (T&C refer warranty card). Key details: Single size, 6-inch mattress thickness, spring mattress construction. Thickness 15 cm/6 inches. Medium Firm. Built to last with a 10 years Warranty durability guarantee (T&C refer warranty card). High Resilience Foam adds responsive cushioning to support a comfortable and supportive feel. Bring a more inviting sense of comfort to your Bedroom and create a space made for winding down at the end of the day.