High density foam has a compression rate of 44 lbs. 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 don't want a cushion that's hard as a rock or a mattress that sinks when you sit on it, you have to check the compression or ILD number.
Mybecca 5 X 24x 72upholstery Foam Cushion High Density (Seat Replac – Mybecca Home Furnishing
Custom Cut Tier 21 Upholstery Foam Cushion High
FoamTouch 1x24x72HDF Upholstery Foam 1x24x72, 1 Indonesia
FoamTouch 1 X 36 X 72 Upholstery Foam Cushion High Density : Arts, Crafts & Sewing
FoamTouch 2 X 36 X 72 Upholstery Foam Cushion High Density : Arts, Crafts & Sewing
Comfort Works Replacement Cover for IKEA Söderhamn 3 Seater
Made in USA Uses : ideal for oval and round poker tables, furniture cushions, boat cushions, car cushions, foam mattresses and bedding support Density
FoamRush 2 x 30 x 30 Upholstery Foam Cushion High Density (Chair Cushion Square Foam for Dinning Chairs, Wheelchair Seat Cushion Replacement)
1 pc. of 2x36x36 + 2 pcs. of 1x36x72
3X24X72 High Density Polyurethane Foam, 3 X24 X72 Inches, White
FoamRush 5 x 36 x 36 Cool Gel Memory Foam
Hacks and concerns for Soderhamn couches? : r/ikeahacks
Made in USA: All of our products are proudly made in the USA! Polyurethane foam, Good for Couch cushions, seat cushions, bench cushions, mattresses,
FoamTouch 1 X 36 X 72 Upholstery Foam Cushion High Density
AK TRADING CO High Density Flexible Polyurethane Taiwan
FoamTouch 1 X 36 X 72 Upholstery Foam Cushion High Density: Back & Seat Cushions