The Opal Mattress has an Encapsulated Superior 12.5g Bonnell spring unit with Memory and kay-flexfoam. The firm 12.5g Bonnell Springs are the thickest and strongest you can get creating a firm but comfortable feel to your mattress.

• 12.5 Bonnell Springs
• Visco Memory Foam
• Kay-flexfoam
• Luxury Knitted Cover