upholstery foam density

Upholstery foam density is one of the best clues to how long a cushion will hold its shape. Density is measured in pounds per cubic foot and tells you how much material is packed into the foam. More material generally means better support and a longer life under daily use.

Density vs. Firmness

Density and firmness are not the same thing. Foam firmness, often listed as an ILD rating, describes how soft or hard the foam feels when you sit down. High-density foam can still feel plush. Low-density foam can feel firm at first but break down faster.

Choosing Foam for Your Project

• Seat cushions: High-density seat cushion foam stands up best to frequent sitting on sofas, dining chairs, and benches.
• Back cushions and pillows: Medium-density or softer foam offers comfort where support matters less.
• Outdoor seating: Look for quick-dry foam with an open-cell structure that drains water and helps resist mildew.
• Occasional use: Lower-density foam can work for decorative pieces and rarely used seats.

Find Your Cushion Foam

Ready to rebuild a worn seat with replacement cushion foam or start a new upholstery project? Browse the foam selection below and compare options to match your comfort and durability needs.