The Leisure Key Firm by Biscayne Bedding Features a Heavy 13 Gauge 504 Tempered Coil Unit that is Encased with 3 1/2" of Durable Foam to Prevent Rollout and Provide Edge to Edge Sleep Comfort. Layers of High Density Firm Foam Create a Comfortable and Durable Sleep Surface. All Wrapped in a Premium Knit Fabric and Backed by Biscayne's 10 Year Non-Prorated Warranty.