Mybecca Upholstery Foam 4" x 24" x 24" Medium Density Cushion Medium Density - 36LB Compression - 1.4ILD - 100% Recovery Rate Ideal for mattress topper, furniture, boat seats, car seats, and other applications Last 7 to 10 years Care Instructions: when unpacking, allow at least 2 days for the foam to breathe in order to recover its original size and form. CA Technical Bulletin 117 Flame Retardancy Test