Hybrid 12 Inches Full Mattress in Box Sized 54X75 Designed for Medium Firm Support with High Density Cold Foam and Bonnell Springs Perfect for People Looking Forward to a Comfortable Sleep Every Night Crafted with High Density Comfort Cold Foam and Bonnell Springs this Medium Firm Hybrid for Bed Mattress is Ideal for Adults, Teens, Kids and Guests Offering Durable Support and Breathable Design for All Ages Tight Euro Top with High Density Foam Provides Pressure Relief, Optimal Spine Alignment and Balanced Support while Pocketed Coils and Hybrid Construction Enhance Comfort Enjoy Restful Nights and Quality Family Time on a Medium Firm Hybrid for Bed Full Mattress Offering Motion Isolation, Comfortable Sleep for All Positions and Long Lasting Support Perfect for Bedrooms and Guest Rooms Mattress Expands to Full Shape Within 48 to 72 Hours After Unboxing Allowing Airflow, Material Adjustment and Long Lasting Comfort Ensuring Years of Use for Adults, Kids and Teens Full Mattress 12 Inches 54X75 White – Medium Firm Hybrid for Bed – Full Size Mattress Bonnell Springs Tight Euro Top High Density & Cool Comfort Foam – Rolled in a Box