high density foam vs polyurethane

Comparing high density foam vs polyurethane can be confusing, because most high density foam is actually made from polyurethane. The real difference is density, which shapes how a cushion feels, how well it holds its shape and how long it lasts. Knowing what to look for helps you choose the right upholstery foam before you cut a single piece of fabric.

What Sets High Density Foam Apart

Standard Polyurethane Foam

Lower density polyurethane foam is lightweight and budget friendly. It works well for back cushions, throw pillows, crafts and pieces that see occasional use, but it can soften and flatten sooner under daily weight.

High Density Polyurethane Foam

High density foam packs more material into the same space, so it resists sagging and keeps its support longer. That makes it a popular choice for seat cushion foam, benches, window seats and outdoor or high traffic furniture.

How to Choose

• Use: Daily seating calls for higher density.
• Feel: Firmness is separate from density, so check both.
• Thickness: Deeper seats need thicker foam for comfort.
• Cover: Pair foam with durable upholstery fabric.

Ready to build or refresh your cushions? Browse the foam and upholstery options below to find the right fit for your project.