Choosing foam for upholstery starts with the job the finished cushion or padded panel must do. A dining chair seat, sofa back, window seat and headboard may all use flexible foam, but they place different demands on it. The correct upholstery foam sheets should be selected by application, expected use, available depth and preferred feel, not by colour or thickness alone. Seating normally needs a grade designed to support repeated weight and recover after compression. Back cushions and padded panels can often use a softer or medium grade because they carry less direct load. Before ordering, identify whether the foam will be sat on, leaned against, wrapped around an edge or used only as light padding. That first decision removes unsuitable grades and makes the remaining choices easier to compare.
Start with the exact upholstery application
The word upholstery covers several types of project. Treating them as one category can lead to foam that is too soft, too firm or unsuitable for the load.
Seat cushions
Seat cushions carry concentrated body weight and are compressed repeatedly. They usually need a supportive seating grade rather than a light padding foam. The correct choice depends on cushion depth, the support beneath it and how frequently the furniture will be used.
A deep sofa cushion has more material available to compress than a thin dining chair pad. A shallow seat may therefore need a firmer grade to avoid excessive compression. The base also affects the result. A solid board feels different from webbing, springs or a flexible platform even when the same foam is used.
Back cushions
Back cushions generally carry less direct load. Medium foam can provide shape and support without making the back unnecessarily hard. A fixed upright back, loose cushion and shaped bolster may each need a different construction, so measure the complete cover and check how the cushion is supported.
Headboards and padded panels
Headboards, pelmets and decorative panels need shape and light cushioning rather than seating support. Average-Soft Foam is intended for headboards, general padding and similar light uses, but it is not recommended for seating. Choosing a lighter grade for a non-load-bearing panel can also make it easier to wrap around edges.
Benches and window seats
Bench and window-seat cushions often sit over a firm base and need a more supportive grade. High-Firm or suitable Reflex foam may be more appropriate than light general padding. Check the available depth and expected use before deciding.
Contract and heavy-use projects
Commercial seating and specialist applications may require very firm or reconstituted foam. Reconstituted grades are dense products made from bonded foam fragments. They can suit contract seating and robust commercial uses, but their feel is different from conventional comfort foam. Select them for a defined requirement rather than treating them as an automatic upgrade for domestic cushions.
Compare the current All Foam upholstery grades
Each product card states the intended use, available sheet sizes, thicknesses and fire information. The main differences are as follows.
Average-Soft Foam Sheet
Average-Soft is a light-density, fire-retardant grade for headboards, light padding, craft work and protective packaging. It is not recommended for seating. Extra thickness does not change that restriction.
Medium Foam Sheet
Medium Foam is a versatile pale green grade for general upholstery, back cushions, padding and everyday foam projects. It can suit work that needs a balanced feel without the extra resistance of a firm seating grade.
Medium does not mean suitable for every cushion. Frequently used seats, shallow pads or customers who prefer firmer support may need another option.
High-Firm Foam Sheet
High-Firm Foam is a light blue upholstery grade for seating, benches and projects that need greater firmness and support. It resists compression more strongly than Medium Foam and is a practical option where a softer grade would feel too yielding.
Reflex Pink Medium Foam Sheet
Reflex Pink Medium is a branded foam with instant recovery. It has a supportive feel and is slightly softer than Reflex Grey Firm. It suits premium seating, mattress and upholstery applications where responsive recovery is wanted.
Reflex Grey Firm Foam Sheet
Reflex Grey Firm provides a firmer, resilient feel with instant recovery. It is suitable for seating, mattresses and premium upholstery projects that require more resistance to compression than Reflex Medium.
Neither Reflex grade is universally better. The choice depends on whether the project needs the softer of the two responsive grades or the firmer alternative.
Severe Very Firm Foam Sheet
Severe Very Firm is a seating-grade foam for applications that need extra firmness. The current product guidance highlights thinner seat cushions, particularly those under around 2 or 3 inches, as a common use. It can feel excessive in a deep cushion when a softer result is expected, so match it to the available depth and preferred feel.
Reconstituted Foam Sheets
The 6lb Reconstituted Foam is a very firm, cost-effective contract seating grade. The 9lb version is super-dense and is listed for industrial matting, gym mats, protective packaging and commercial seating. Their mixed-colour appearance is a normal result of using bonded foam fragments.
These products are useful where density and robust support are required, but they should not be confused with softer comfort foam.
Specialist products that are not general seating foam
Cot Safe Foam is a specialist nursery grade for cot mattresses, headboards, crafts and costumes. Its product information states that it is not suitable for seating. Packaging foam may also look similar to upholstery material, but it is designed for protection rather than furniture comfort. Always use the stated application as the first filter.
For two common refurbishment jobs, see the replacement sofa cushion foam guide and the dining chair foam replacement guide. They apply the same grade-selection principles to deeper sofa cushions and shallower chair pads.
Understand firmness, density and recovery
Firmness, density and recovery are different properties.
- Firmness describes resistance to compression.
- Density relates to the amount of material within a given volume of foam.
- Recovery describes how the foam returns after the load is removed.
A higher-density product is not automatically the firmest, and a firm product is not necessarily the densest. This matters when comparing standard polyurethane foam, Reflex grades and reconstituted products. Our foam density versus firmness guide explains the distinction in more detail.
The finished feel is also affected by body weight, seating position, cushion depth, cover tension and the support beneath the foam. Product names are a useful starting point, but the complete furniture construction determines the result.
Choose thickness together with the foam grade
Thickness affects how far foam can compress and how the load is spread. It should not be chosen in isolation.
Thin sheets are commonly used for wrapping, lining, light padding and shallow chair pads. Deeper foam is generally more suitable for substantial seat cushions because it provides more material before the user reaches the support underneath. Extra thickness cannot, however, make an unsuitable grade appropriate for seating.
For example:
- Average-Soft Foam remains unsuitable for seating even in a deep sheet.
- Severe Very Firm Foam may suit a shallow seat but feel unnecessarily hard in a deep lounge cushion.
- Medium Foam may work well for a back cushion at a depth that would not support a frequently used seat.
- A tight, non-stretch cover can make the finished cushion feel firmer.
Most upholstery grades are available across several thicknesses, commonly from approximately 6.3mm to 101.6mm depending on the product. Check the exact selector and visible price table because the options differ between grades. The foam sheet thickness guide gives further application-led guidance.
Measure the cover, foam and furniture separately
Old foam can shrink, soften or become misshapen, while an empty cover can stretch. Do not rely on one measurement taken from the worn insert.
Record:
- the finished width, length and depth
- whether the edges are straight, tapered or curved
- the internal dimensions of any fixed frame
- the condition and dimensions of the cover
- the type of support beneath the cushion
- any piping, zip or internal seam that reduces usable space
Measure in several places when the shape is not perfectly square. Compare front and back widths, both side lengths and more than one depth point where necessary.
Do not add an arbitrary allowance to every measurement. The required fullness depends on cover construction, fabric stretch and upholstery method. Where exact fit matters, follow the dimensions specified by the upholsterer or pattern maker. Use the foam measuring guide for a fuller checklist.
Inspect the support beneath the cushion
The same foam can feel different on a solid board, webbing, springs or flexible slats. Worn support can also make new foam feel softer or less stable than expected.
Before replacing a cushion, check for:
- stretched or broken webbing
- damaged springs
- cracked boards or slats
- loose frame joints
- sharp edges that could damage the foam
- moisture or contamination inside the furniture
New foam replaces the cushion core. It cannot repair a failed frame or support system, so structural faults should be corrected first.
Confirm fire performance before ordering
Fire performance must be checked against the actual product and intended use. All Foam identifies fire-retardant upholstery grades on the product cards and provides product-specific documents through the foam data sheets page.
Do not assume that every flexible foam sheet has the same fire performance. Packaging and specialist products may have different classifications or be unsuitable for furniture. Where a domestic, contract or commercial project has a stated requirement, use the relevant data sheet rather than relying on colour or a general category name.
The finished furniture may have requirements beyond the foam itself. Confirm the specification that applies to the complete project before ordering. The fire-retardant foam sheet guide explains which product information to review.
Plan the cuts before buying a full sheet
Foam sheets are sold in the dimensions shown on each product card. Work out how many finished pieces fit on the selected sheet before ordering.
Draw a simple cutting plan with every cushion marked by width and length. Curves, tapers and angled backs create more waste than plain rectangles. Allow enough space for the intended cutting method and check that every finished piece uses the correct depth.
Flexible foam can often be trimmed with suitable sharp equipment and a stable guide. Thick sheets and repeated cuts are harder to keep square by hand. Precise, repeated or complex shapes may require professional cutting equipment.
Check the cover as part of the project
A cover affects appearance and feel. A tight cover can restrict the surface and make a cushion feel firmer. A loose or stretched cover can make correctly sized foam look underfilled. Wadding and wrap layers also change the finished dimensions.
Inspect the zip, seams, fabric stretch, lining and piping before reusing the cover. Follow its cleaning instructions and do not force foam through an opening that is too small, as this can damage the zip or distort the insert.
Common mistakes to avoid
- Choosing by colour: colour helps identify products in the All Foam range, but it is not a complete performance specification.
- Automatically selecting the firmest grade: very firm foam is useful for defined applications but may be uncomfortable in a deep domestic cushion.
- Using light padding foam for a seat: Average-Soft and Cot Safe products are not seating grades.
- Ignoring the furniture base: new foam cannot correct broken springs, webbing or frames.
- Ignoring the cover: stretched, shrunken or damaged fabric can spoil the fit of correctly measured foam.
- Skipping technical information: where fire performance or another property matters, check the product data sheet before purchase.
A reliable upholstery foam selection process
Use this order when comparing products:
- Define whether the foam is for a seat, back, headboard, panel or specialist application.
- Record the finished width, length and depth.
- Inspect the frame, support and cover for faults.
- Remove products that are not suitable for the intended use.
- Decide whether the priority is softer cushioning, balanced support, firm seating or very firm contract performance.
- Compare the exact thicknesses and sheet sizes for the shortlisted grades.
- Check fire information and the data sheet where required.
- Plan the cuts needed from the full sheet.
- Confirm the selected options and quantity before adding the product to the basket.
For light decorative padding and headboards, Average-Soft Foam may be suitable. Medium Foam works for many back cushions and general upholstery jobs. High-Firm and Reflex grades provide more supportive seating options. Severe Very Firm can suit shallow cushions needing extra resistance, while reconstituted foam serves dense contract, commercial and specialist applications.
The correct result depends on the complete construction, not one product label. Review the product card and data sheet before ordering, particularly where seating suitability or fire performance is important. For an unusual project, contact the All Foam team with the application, finished dimensions, expected use and preferred firmness so the available grades can be compared accurately.
