what is high density foam

If you're replacing a sagging sofa cushion or building a window seat, you've probably asked, what is high density foam, and why does it matter? Simply put, it's polyurethane foam packed with more material per cubic foot, so it holds its shape, resists flattening, and lasts far longer than lightweight foam under daily use.

Understanding Foam Density

Density measures how much foam is in a given volume, usually expressed in pounds per cubic foot. Foam around 1.8 pounds or more is generally considered high density. More material means better support and a longer life for high density cushion foam.

Density vs. Firmness

Density and firmness aren't the same thing. Firmness describes how soft or hard the foam feels when you sit on it, while density reflects durability. You can find high density foam that feels plush or firm, so choose based on both comfort and how much wear the piece will see.

Where High Density Foam Works Best

• Sofa, chair and dining seat cushions
• Window seats, benches and banquettes
• Outdoor and patio cushions (with proper covers)
• RV, boat and headboard upholstery

Ready to start your project? Browse the high density upholstery foam options below and find the right thickness and feel for your cushions.