... fabric,440g/m 1.2 quilted cover foam:1.5cm(H),density 25kg/m3 2 Felt:550g/m2,2 layers 3 Insulator ... :net 32,noise-proof 4 Superlastic spring:17cm(H),wire gauge 1.8mm 5 Insulator:net32,noise-proof 6 ... ,2 layers 7.1 Bottom quilted cover foam:1.5cm(H),density 25kg/m3