Firmness @ 25% Deflection

0.4 psi
0.9 psi
1 psi
10 psi
11 psi
13 psi
14 psi
15 psi
17 psi
20 psi
3 psi
3.5 psi
4 psi
6 psi
7 psi
8 psi
9 psi
9 to 13 psi