medium density foam 36 ild

If you want seating that feels supportive without being stiff, medium density foam 36 ILD is a reliable middle ground. It suits everyday projects like dining chair pads, bench cushions, headboards, and replacement sofa cushions, where comfort and shape retention both matter.

What 36 ILD Means

ILD stands for Indentation Load Deflection, a common foam firmness rating. It describes how much force it takes to compress a piece of foam by a set amount. A 36 ILD rating generally lands in the medium firm range: soft enough to sit on comfortably, yet firm enough to keep from bottoming out.

Density vs. Firmness

Density and firmness are not the same thing. Density relates to how much material is in the foam and often affects how long it holds up. ILD describes how firm it feels. Medium density paired with a moderate ILD makes a balanced choice for upholstery foam used on chairs and benches.

Choosing the Right Foam

• Thickness: Thicker foam suits seat cushions, and thinner foam works for backs and pads.
• Use: Consider how often the piece will be used and who will be sitting on it.
• Fit: Measure your frame or cover carefully before you cut.

Browse our foam selection below to find the right fit for your next project.