Balanced Support Spring System: The Bonnell spring mattress full uses interconnected coils that are designed to distribute body weight and conform to natural curves, providing balanced support to areas like shoulders/hips. It may help reduce pressure sensation and provide deep sleep all night. Long-Lasting Construction for Extended Use: This mattress in a box full size bed is precision-engineered with hourglass-shaped steel coils with reinforced perimeters that utilize multi-point interlocking. This design aims to resist deformation from daily use, maintaining structural integrity. Enhanced Airflow Layered Design for a Cooling Night's Sleep: The mattress full size bed features an open coil structure combined with breathable knit fabric that promotes natural air circulation. Dissipates heat/humidity 30% faster than foam beds, maintaining a sleep surface 2-5°C cooler for dry comfort. Certified Hybrid Mattress for Healthy Sleep: The hybrid mattress full features CertiPUR-US certified foam and OEKO-TEX STANDARD 102 compliant fabric. Novilla mattress is quilted with a breathable knitted fabric, offering a soft feel. Mattress In a Box & Broad Compatibility: The bed mattress full is rolled and packed for convenient shipping. Simply unbox, unroll, and allow it to expand to full size within 24-74 hours. Compatible with platform beds, slatted bases, adjustable frames, or floor use.