Foam Types Explained: Which Density and Firmness Are Best for Your Sofa or Chair?

Choosing the right foam for your sofa or chair cushions can completely change how comfortable and supportive your furniture feels. Whether you’re upgrading tired seating or replacing old cushions, understanding foam types is the first step to getting it right.

At The Foam Cushion Store, we supply upholstery foam cut to size. Our custom-made foam cushion replacements are crafted to fit your exact measurements and comfort needs. Here’s what you need to know about foam density and firmness before choosing the perfect replacement foam cushions for your furniture.

What Is Foam Density?

Foam density refers to how much material is packed into a cubic metre of foam. It’s measured in kilograms per cubic metre (kg/m3). High density upholstery foam has more material and less air, making it more durable and longer-lasting than lower density foam.

A common misconception is that high density automatically means firmer foam. In fact, density is about quality and lifespan, not softness or hardness. A high density foam can still be soft if it has a low firmness rating.

At The Foam Cushion Store, we recommend high density upholstery foam for most seat cushions, especially if they are used daily. This type of foam holds its shape, supports your body weight properly, and resists sagging over time.

What Is Foam Firmness?

Firmness is a separate rating from density. It describes how soft or firm the foam feels when you sit or lie on it. This is often measured by something called the Indentation Force Deflection (IFD), but in simpler terms, we break it down to soft, medium, firm and very firm.

Choosing the right firmness depends on the cushion’s purpose and the comfort level you prefer. Here are some quick guidelines:

• Soft foam: Best for back cushions, scatter cushions, or where a plush feel is preferred. Not ideal for seat cushions that carry body weight regularly.
• Medium foam: Good for occasional seating or lighter weight use. Offers a nice balance between support and softness.
• Firm foam: Ideal for most seat cushions. Provides consistent support and comfort for daily use.
• Very firm foam: Used where strong support is critical, such as window seats, firm benches, or orthopaedic needs.

Best Foam for Sofas and Chairs

For everyday sofas and chairs, we usually recommend a firm, high density upholstery foam. It gives a solid feel, holds its shape over time, and is well-suited to daily use in busy homes.

Back cushions can be made from medium or soft foam depending on your comfort preference. Some customers choose a combination, using firm foam in the base and softer foam for back and side cushions to get the best of both worlds.

Foam Cushion Replacements Made to Measure

We specialise in made to measure foam cushion replacements. Whether you are reupholstering a vintage armchair or giving your sofa a refresh, we cut every piece of foam to the exact size and shape you need.

We supply foam cushion replacements for all kinds of furniture:

• Sofas and armchairs
• Window seats
• Dining chairs and benches
• Campervan cushions
• Garden furniture

Every order is cut to your specs. Just tell us the size, shape, and intended use. Our team will help you choose the right density and firmness to match.

Why Choose High Density Upholstery Foam?

High density foam costs a little more, but it offers serious value. It lasts longer, resists flattening, and keeps your furniture looking and feeling great. If you’re tired of cushions that go flat or sag, switching to high density upholstery foam can solve the problem.

We recommend it for anyone replacing seat cushions in well-used spaces like living rooms, waiting areas, or dining rooms. It’s also a smart choice for motorhome and boat cushions where durability matters.

Custom-Cut Foam Delivered Nationwide

We make it easy to order replacement foam cushions online. Our cut to size foam service ensures you get exactly what you need with no guesswork. UK nationwide delivery means your custom-made cushions arrive quickly and ready to fit straight into your furniture.

Not sure what you need? No problem. Call us or send us an email for fast support and advice. Our foam experts are here to help you choose the right density, firmness and shape. Whether you’re redoing one cushion or a whole set, we’ll guide you through the process.

Get the Right Fit First Time

Using old, sagging cushions? Upgrading with our high density foam cushion replacements is the easiest way to bring comfort and structure back to your furniture. We cut everything to order, so you always get the perfect fit.

No matter the shape whether that be rectangle, round, T-shaped, or something unique, our team will cut it precisely to your measurements. Just send us your sizes, and we’ll handle the rest.

Need Help Finding the Right Custom-Made Foam?

Ask our experts about foam cut to size. We’re here to make the process easy and stress-free. Get in touch today to start your order.

Call or email The Foam Cushion Store for tailored advice and fast service. We supply high quality replacement foam cushions cut to size and delivered across the UK.