upholstery foam 33 ild

If your sofa cushions have gone flat or your dining chairs feel like sitting on plywood, upholstery foam 33 ILD may be the fix you need. This medium-firm rating gives seats enough support to hold their shape while still feeling comfortable for everyday sitting, which makes it a go-to choice for DIY reupholstery projects.

What Does 33 ILD Mean?

ILD stands for indentation load deflection. It measures how many pounds of pressure it takes to compress a foam sample by 25 percent. The higher the number, the firmer the foam. At 33, this foam sits in the comfortable middle range: supportive without feeling hard.

Best Uses for 33 ILD Foam

• Seat cushions for sofas, loveseats, and accent chairs
• Dining and kitchen chair pads that need to resist bottoming out
• Bench and window seat cushions
• Replacement cushion foam for worn furniture

What to Look For

Measure your cushion covers carefully, and choose a thickness that fills them snugly. Consider density alongside firmness, since high density foam for cushions tends to hold up better under daily use. Wrapping the foam in batting can soften edges and help covers fit smoothly.

Ready to get started? Browse our medium firm upholstery foam options below and find the right fit for your next project.