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 6 H x 24 W x 24 L Upholstery Foam Cushion High Density (Chair Cushion Square Foam for Dinning Chairs, Wheelchair Seat Cushion Replacement) : Arts, Crafts & Sewing
FoamRush 6 H x 26 W x 32 L Upholstery Foam High Density Firm Foam Soft Support (Chair Cushion Square Foam for Dining Chairs, Wheelchair Seat Cushion Replacement) : Arts, Crafts
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FoamRush 4 H x 24 W x 24 L Upholstery Foam Cushion High Density (Chair Cushion Square Foam for Dinning Chairs, Wheelchair Seat Cushion Replacement)
1/2x24x72 Upholstery Foam Cushion High Density, Chair Cushion Square Foam for Dinning Chairs, Wheelchair Seat Cushion Replacement : Arts, Crafts & Sewing
FoamRush 6 H x 26 W x 32 L Upholstery Foam High Density Firm Foam Soft Support (Chair Cushion Square Foam for Dining Chairs, Wheelchair Seat Cushion Replacement) : Arts, Crafts
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Isellfoam Upholstery Foam Cushion High Density 6 T x 24 W x 80 L Extra Firm 50ILD High Density Upholstery Foam Cushion CertiPUR-US Certified Foam, Made in USA : Arts, Crafts