shown in table 2 for sample 1 the amount of mixed cotton 14 filling the mold was chosen to be the same as the volume of the mold parts hence no internal compression of the cotton 14 was produced after closing the mold for sample 4 the amount of mixed cotton 14 filling the mold parts was chosen such that the apparent density of the whole seat pad 10 was 37 3 kg m 3 and the internal compression was 12 0 g cm 3 for samples 2 and 3 the mold was filled with the cotton 14 so as to respectively give the apparent densities shown in table 2 the corresponding compressions having the values shown in the table after filling the mold and closing it the samples 1 to were heated according to the method described in example 1 and the apparent density of each layer was measured table 3______________________________________apparent density of layers kg m sup 3 sample 1 sample 2 sample 3 sample 4______________________________________average density 18 1 23 8 29 5 37 31 20 1 32 8 46 4 60 42 19 4 28 1 34 4 45 23 18 7 24 7 32 9 40 94 19 1 23 5 29 7 38 45 18 2 23 0 28 0 33 36 18 0 21 3 26 2 32 57 17 2 20 6 24 7 29 28 16 5 19 9 24 3.