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.
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Product Description Our foams are the USA! High density foam has a compression rate of 44 lbs. This means for every 44 lbs on a general idea, your foam will compress by 25%. High density foam is designed for heavy traffic and high use applications. 100% recovery rate durability : durable, high density foam suitable for long-term use. foam sheets are sold per sheet not per yard and rolled for packaging.
FoamTouch Upholstery Foam 2 x 24 x 72 High Density Cushion
FoamTouch Upholstery Foam 2 x 24 x 72 High Density Cushion
5'' X 24'' X 72'' Upholstery Foam Cushion Medium