Best foam for seat cushions
The best foam for a seat cushion is high-density (HD) polyurethane foam — around 1.8–2.5 lb/ft³ density with a firmness (ILD) of 35–45. It supports your weight without bottoming out and holds its shape for years, which is why it outlasts the soft, low-density foam found in most off-the-shelf cushions.
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Seat cushion foam — answered
What is the best foam for a seat cushion?
High-density polyurethane foam at 1.8–2.5 lb/ft³ density with a 35–45 ILD firmness is best for seat cushions. It supports your weight without bottoming out and keeps its shape for years, unlike the low-density foam in most ready-made cushions.
What density foam should I use for a seat cushion?
Use high-density foam of at least 1.8 lb/ft³ for daily-use seats; 2.0–2.5 lb/ft³ lasts longest. Density measures durability, not firmness, so a higher density cushion holds its shape much longer.
What does ILD mean and what number is right?
ILD (Indentation Load Deflection) measures firmness — how hard the foam feels. For everyday seating a 35–45 ILD is the sweet spot: firm enough to support you, soft enough to be comfortable.
Is memory foam good for seat cushions?
Not for upright seating. Memory foam is temperature-sensitive, slow to recover and lets you sink, which is uncomfortable for sitting. High-density foam gives firmer, more consistent support.
How is my cushion cut and shipped?
Enter your width, depth and thickness and we hand-cut CertiPUR-US high-density foam to ±1 cm. Every cushion is made to order and shipped worldwide with free tracked delivery, covered by a 14-day perfect-fit guarantee.
Not sure which foam to pick? We'll help — free.
Tell us where the cushion goes and how firm you like it. Our makers reply with the right foam and confirm the fit before we make it.
