HRBack to product range HR30Density: 30 kg/m3 Strength: 3,0 Kpa HR35Density: 35 kg/m3 Strength: 3,9 Kpa HR42Density: 42 kg/m3 Strength:: 2,5 Kpa HR55Density: 55 kg/m3 Strength: 3.5 Kpa