• Comparison between a sagging sofa cushion and restored firmness
  • Dimensions and number of support inserts for different sofa sizes
  • Four steps to install the support insert in the sofa
  • Folded layers of high-density foam for sofa cushion
  • Hand pressing the foam to show its rebound
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High-Density Foam Sofa Cushion Support Insert – Firmer Seat Instantly

High-Density Foam Sofa Cushion Support Insert – Firmer Seat Instantly

£59.00
£39.00
Save £20.00
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Folded layers of high-density foam for a sofa cushion
✓40D high-density foam ✓Easy to cut to the right size ✓Ergonomically curved design ✓Fits sofas, armchairs & chairs ✓Installed in under a minute

The problem

A sofa cushion support insert rescues sagging sofa cushions

Tired of sinking into a flat, worn-out sofa cushion every time you sit down? Over time the foam in sofa cushions loses its bounce, and the result is an uncomfortable seat that neither supports your back nor feels fresh. This support insert is simply placed under the existing cushion – it instantly restores firmness without you having to buy a new sofa or new cushions.

How it works

Done in four easy steps

1
Remove the cushion
Lift the sagging seat cushion off the sofa or armchair.
2
Cut to size
Easily cut the foam pad to the exact dimensions with ordinary scissors.
3
Place it in the center
Lay the support insert centered on the seat, under the existing padding.
4
Put the cushion back
Put the cushion back – done! The seat is instantly firmer.
Four steps to install the support insert in the sofa

The material

40D high-density foam that holds its shape

The support insert is made of 40D high-density foam that spreads your body weight evenly across the whole seat. Compared with a cushion that has already sagged, the curved, ergonomic shape gives a visible lift right away – the cushion is pushed upward instead of sinking down every time you sit.

Comparison of a sagging sofa cushion and restored firmness

The shape

A hidden edge that doesn’t show on the sofa

The tapered, curved edge is designed to hide inside the cushion padding – the look of your sofa is not affected. The foam has high resilience, which means it quickly regains its shape after pressure, sitting after sitting.

A hand pressing the foam to show how it springs back

Comparison

Support insert or a new sofa?

Support insert New sofa New cushion covers only
Fixes sagging cushions ✓ ✓ ✗
Done in minutes ✓ ✗ –
Low cost ✓ ✗ –

Specifications

Dimensions and material

Material 40D high-density foam
Color Gray
Dimensions 50 × 50 cm (19.7 × 19.7 in), 5 cm (2 in) thick
Fits Sofas, armchairs and chairs with sagging seat cushions
Customizable Easy to trim with scissors for an exact fit
Dimensions and number of support inserts for different sofa sizes
View full details

Frequently asked questions

What are the dimensions of the support insert?

The support insert measures 50 × 50 cm and is 5 cm thick (20W x 20D x 2H in).

What is the support insert made of?

It is made of gray 40D high-density foam, shaped with an ergonomically curved design.

Can I adjust the size?

Yes, the foam is easy to trim with ordinary scissors to fit your sofa, armchair or chair exactly.

How do I install the support insert?

Remove the sagging seat cushion, trim the foam to size if needed, place it in the middle of the seat and put the cushion back.

Is the support insert visible once the cushion is back in place?

No, the tapered edge is designed to hide inside the cushion padding and does not affect how the sofa looks.