High density foam has a compression rate of 44lbs. It features the perfect amount of cushioning and stiffness. Its soft but still holds its firmness and support for an individual to sit on it without compressing the foam too much. Compression = firmness compression (not density) is what determines firmness. If you dont want a cushion thats hard as a rock or a mattress that sinks when you sit on it, you have to check the compression or ild number.
FoamRush 4 H x 24 W x 24 L Upholstery Foam Cushion High
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24 X 29 Upholstery Foam Cushion Medium Density
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FoamRush 3 x 24 x 27 Upholstery Foam High Density
Mybecca Upholstery Foam Cushion Sheet High Density, 3 H x 24 W x 72 L : Arts, Crafts & Sewing
FoamRush 6 x 24 x 27 Upholstery Foam High Density
FOAMMA 8 x 24 x 72 High Density Upholstery Foam