High Density Polyurethane Foam (Extra Firm) 1" x 48" x 80"
SKU: 281X4880
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High Density Polyurethane Foam is the best choice when you need a high-quality, long-lasting and dependable indoor-use foam ideal for heavy-use applications. Its density means it will provide excellent support while still delivering on comfort, making it ideal for high-traffic seating cushions (such as couches and sofas), benches, cabin seating and sleeping berths.

For outdoor use, consider Dry Fast or Medium Density Polyurethane Foam. For covered outdoor areas demanding the best comfort, High Density foam should be used, and silk film should be wrapped around the foam to help keep moisture out. Also use an upholstery fabric that has high water resistance or can be treated with a waterproofing solution.

High Density Polyurethane Foam will typically last up to 12 years. It has an extra firm stiffness, a density of 2.8 pounds per cubic foot and a foam IFD (Indentation Force Deflection) of 80 pounds.

The Sailrite® Blade Foam Saw expertly cuts through a full range of foam types. A standard electric kitchen knife can also be used, though the results won’t look as professional. To glue two pieces of foam together, Sailrite recommends using spray adhesive. Foam can also be glued on the sides to make a wider piece or layered to make thicker cushions. If layering foams with different stiffness levels, the firmer foam should be the bottom layer.

Please Note: Sheet size may vary up to 2 inches in length and 1 inch in width.

Important: Items are compressed for shipping, we recommend unrolling as soon as possible. Compressed foam takes up to a week to regain its original size and shape. Allow foam to fully decompress before cutting or using in a project.


Sale Unit: EA
Length: 80"
Width: 48"
Thickness: 1"
Foam Density: 2.8 pounds per cubic foot
Foam IFD: 80 pounds
Foam Material: Polyurethane
Foam Firmness is a measurement of the foam’s softness. Indention Force Deflection, or IFD, is the pressure in pounds needed to compress a 50 square inch circular plate 25% of the way into the foam.

At a Glance

Foam Usage: Frequent
Foam Uses: Automotive Seating, Helm Seats, Home Decor Cushions, Patio Cushions, Pontoon Seats, Powerboat Seats, Salon Cushions
Foam Firmness: Extra Firm



A. 1"
B. 48"
C. 80"


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Types of Foam for Cushions & Upholstery

In this helpful video, we will walk you through all the different types of foam Sailrite has to offer. Understanding the properties and uses of different foam types will help you know which one is right for your DIY project. The four types of foam we will cover are high density, medium density, open cell (Dry Fast) and a closed cell foam. After watching this video, you will be able to select the correct foam for your cushion or upholstery application.

Gluing Foam With Foam Lock Spray Adhesive

We test the holding strength of adhesive spray and see how it holds up when used on different foam types. This spray offers quick tack and high coverage while providing a very strong bond.

Cutting Foam With the Sailrite® Blade Foam Saw

This high-quality foam cutter is a great tool for both serious DIYers and small upholstery shops. It delivers smooth, clean cuts through many types of foam for professional-looking results every time.

Cutting Foam With an Electric Kitchen Knife

This video shows you how to use a standard electric kitchen knife to trim your foam to size, including some tricks to achieving a sharp cut line and using weights to keep the foam in place while cutting.


Overall Rating : 4.9 10 Reviews

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Verified Purchase


The best foam on the planet, my friend built a sleeping platform in my Transit, and I used this foam under a 4 inch foam pad the size of a twin mattress, it keeps it from bottoming out, its perfect!!

Cyndy Spacil
Verified Purchase

As advertised.

William Bradley
Verified Purchase

Couldn't find it locally. Doesn't collapse upon sitting upon.

Jennifer R.
Verified Purchase

I haven't added the foam to my sofa cushions yet, but I did open it to see how it felt.

Jann Normington
Verified Purchase

Nice and dense as advertised

Linda Butters Freund
Verified Purchase

Prompt delivery...paid for two day...made cushion...done!

Wanda Stotts
Verified Purchase

Perfect foam for my headboard.

Ingrid Santangelo
Verified Purchase

Always a satisfied customer. Been shopping Sailright for 20+ years.

David Stow

Excellent Quality and Durability

Definitely extra firm like we wanted for our couch. We wanted extra firm and that is exactly what it is, yet comfortable for my back which needs lots of support. It has been over 6 months since we reupholstered the couch and with heavy daily use I don't see any wear or deterioration of the foam. This foam is unlike other foam we used before which wore quickly and lost it's strength. This Sailrite foam is outstanding. Thank you so much for this product and my back thanks you too!

Verified Purchase

I think this will work great for my project. It did have an odor to it for about a week after opening but it wasn't so strong that I couldn't have it in my home. I did however keep it in a room where we don't go much to let it air out because it was enough to cause a mild headache.

Sailrite support has reached out to this customer directly to resolve the issue or concern.

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