upholstery foam 4x24x80

A sheet of upholstery foam 4x24x80 is one of the most versatile pieces a DIY upholsterer can keep on hand. At 4 inches thick, 24 inches wide and 80 inches long, it is sized for long, narrow seating where a seamless cushion looks and feels better than several pieced-together pads.

Where a 24 x 80 Foam Pad Works Best

This long format suits projects that would otherwise need multiple cuts or awkward seams:

• Window seats and banquettes that run along a wall
• Daybed and trundle mattresses needing a slim, even surface
• Bench cushions for entryways, mudrooms and patios
• Camper, boat and RV seating that can be trimmed to fit

What to Look For

Density and Firmness

Density affects how well the foam holds its shape over time, while firmness determines how it feels when you sit. For frequently used seating, a higher density foam is usually the better long-term choice. Softer options suit back cushions or occasional-use pieces.

Fit and Finishing

Measure your frame before cutting, and consider wrapping the foam in batting for a fuller, rounded look under your fabric.

Ready to start? Browse the 4 inch foam options below to find the right match for your next project.