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. Compression means the number of pounds necessary to compress a piece of foam 25% and still bounce back to the original thickness. For example, a 4 thick piece of foam that requires 33 lbs. To pack it down 1 and have it return to its full 4 thickness has a 33 lb. Compression rating or (ild) -indention load deflection. - all foam sheets are sold per sheet - not per yard. Do not open with a box cutter. Use a ball point pen or a pencil. Start by making a little incision and break it from there - durability : will last 7 to 10 yearshigh density foam is used for firmness yet relaxable cushion. It has high quality compression and material to keep it lasting for longer periods of time even when harsh weight is applied. Made in the USA 100% recovery ratea and lasts from 3-7 yrs Density : 1.8 , 44lb compression Ideal for poker tables, furniture cushions, boat cushions, car cushions and all other home and commercial upholstery applications ASIN B0719PSC6W Color White Brand Name FoamTouch Unit Count 13.33 Square Feet Item Weight 2 pounds Manufacturer FoamTouch Model Number 1x24x80HDF Material Type Polyurethane Item Type Name Upholstery Foam Number of Items 1 Item Dimensions L x W 80 L x 24 W Manufacturer Part Number 1x24x80HDF