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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 don't 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 years high density foam is used for firmness yet relax able cushion. It has high quality compression and material to keep it lasting for longer periods of time even when harsh weight is applied. Upholstery Foam Return Policy: We do not return fees. Your item must be unused and in the same condition that you received it in. Once your item has been returned to our returns department, there is 50% restocking fee on all returned items. About our Foam: Our foam is certified for the quality. Our foam is certified passing QC standards. Our foam is uniquely formulated to deliver an ideal harmony of reinforcement, coziness, and resilience. Our foam stands out due to delivering an ideal blend of support, comfort, and long-lasting resilience. Certipur-US for Assurance: Foamrush employs exclusively exceptional foam and you can utilize them for projects in your home. All of our foam is certified as being secure, better for health and the environment when contrasted with non-certified or non-regulated foam. We also offer foam products that are made cut-to-order to ensure the utmost excellence for our customers. Our foam is proudly made in USA. Use for Variety of Projects: Foam is not just for sofas and chairs It can be customized to repair worn down chairs, create custom cushions for patio chairs and benches, ottomans, stools, headboards, RVs, boat seats, car seats, golf cart seats, workout benches, cots, window seats, restore vintage furniture, foam mattress toppers and carrying cases for delicate glass or ceramic items, packing foam for delicate glass or ceramic items, accent pillows and many other crafts and DIY projects Easy to Customize: Our foam is easy to work through with tools such as most slicing device. You can trim the edges or stack layers for extra thickness to customize our foam in a way that meets your needs. Foam can also be glued together to create wider pieces or layered upon one another to create thicker cushions. Foamrush foam can be cut and customized to whatever size or shape you need. Foam Care Instructions: Open your package immediately. Please use caution and do not use a box cutter or anything sharp to open your box as you may cut through and tear into the foam. Remove your foam from the box and unroll it so that it may relax. Allow up to 3 to 4 days for the foam to fully expand to its original size as your foam has been rolled into a bundle and compressed. Please do not cut your foam until you have followed these product care instructions. ASIN B07SF78CDG Color Premium High Density Material Foam Brand Name FoamRush Item Shape Square Unit Count 1.0 Count Item Weight 16 ounces Grade Rating Commercial Manufacturer FoamRush Item Diameter 5 Inches Item Thickness 4 Inches Item Dimensions 36 x 36 x 0.04 inches Number of Items 1 Specification Met Yes EU Spare Part Availability Duration 7 Years