upholstery foam 36 ild

Choosing upholstery foam 36 ILD is one of the simplest ways to give seat cushions the firm, lasting support they need. Whether you're re-padding dining chairs, building a window seat, or reviving a tired sofa, the right firmness helps your project look and feel professionally finished.

What Does 36 ILD Mean?

ILD stands for indentation load deflection, a measure of how much force it takes to compress foam by 25 percent. A rating around 36 sits in the firm range, so 36 ILD foam holds its shape under everyday sitting instead of flattening out or bottoming out.

Best Uses for Firm Seat Foam

• Dining and kitchen chair seats
• Benches, banquettes, and window seats
• Sofa and loveseat seat cushions
• Replacement cushion foam for worn-out furniture

What to Look For

Consider thickness and density alongside firmness. A thicker cushion can feel a bit softer at the same ILD, while high density foam for cushions generally resists sagging longer. Wrapping your seat cushion foam in polyester batting adds a smooth, rounded look under your upholstery fabric.

Find Your Foam

Ready to start your next cushion? Browse our firm upholstery foam options below and choose the size and thickness that fit your project.