Pure Green 100% Natural Latex Mattress Topper - Soft - 1" Twin Size Latex Provides Amazing Pinpointed Support - Sleep Better Instantly 100% Natural Latex - No Synthetic Latex - No Fillers Soft but also supportive (Firmness rating is 20 ILD) 4.0 lbs/cubic ft Latex Foam Naturally Stays Cool 20 ILD (A Measurement of Firmness) 4 Lbs/ Cubic Ft (Density)