Triangle Foam Cut to Size

Made-to-Measure Triangle Foam Cut to Size for Cushions, Beds & Campervans

Enter your sizes, choose your firmness, and customise with extras like Dacron or stockinette — ⏱️ Order by 11:00am (Mon–Fri) Most orders Shipped Next Day! 

✅ Rated Excellent on Trustpilot
🔥 Wide range of fire-retardant foam to UK standards
🛠️ CNC precision-cut, made to measure in the UK
🧵 Need a new cover? Made-to-Measure Cushion Covers.

Measurements

Measurements

Reference Image

Choose Foam Grade

STANDARD FIRM RX33 (BLUE)

Medium density firm foam. Suitable for seating perfect for sofas, dining chairs, boats, caravans, and camper van seating and mattresses. Best choice for cushions 3–4 inches thick. May be too firm for cushions above 5” in thickness  

Grade
RX33
Notional Hardness
200 N
Density
33 kg / m3
Properties
Flame Retardant
Firm, Medium Density Foam

PREMIUM HIGH FIRM RX39 (BLUE)

Most popular High density firm foam. Suitable for seating perfect for sofas, dining chairs, boats, caravans, and camper van seating and mattresses. Best choice for cushions 3–4 inches thick. May be too firm for cushions above 5” in thickness

Grade
RX39/200
Density
39 kg / m3
Properties
Flame Retardant
Highly Recommended Firm Seating & Mattress Foam

PREMIUM MEDIUM FIRM RX39 (ORANGE)

RX39/120 Orange Foam CushionsA popular high-density foam with a soft to medium feel. Ideal for achieving a medium comfort level in thicker cushions or a softer feel in thinner ones. Also works well as a top layer over firmer foam to enhance comfort.

Grade
RX39/120
Notional Hardness
120 N
Density
39 kg / m3

STANDARD MEDIUM FIRM RX36 (BEIGE)

Medium density, medium firm foam offers instant recovery after use and consistent shape retention over many years. Excellent for deep fill armchair cushions, sofa cushions, or as a mattress of 5” thickness or above

Grade
RX36
Notional Hardness
125 N
Density
36 kg / m3
Properties
Flame Retardant

PREMIUM MEDIUM FIRM REFLEX 40H (GREY)

High density, medium firm foam Reflex 40h is a high-quality foam known for lasting comfort and support. It bounces back quickly and keeps its shape for years—perfect for sofa cushions, armchairs, or even as a mattress.

Grade
REFLEX 40 H
Notional Hardness
150 N
Density
40 kg / m3
Properties
Flame Retardant
Highly Recommended, High Density, Medium Firm, Seating & Mattress Foam

SUPERIOR HIGH DENSITY FIRM RG50 (WHITE)

High density firm foam RG50 is a high-density, firm foam ideal for heavy-duty support. It’s commonly used in seat cushions, gym mats, and other applications where durability and strong support are key. This is the perfect foam for thin Pop-top or Roof-Tent mattresses.

Grade
RG50/230
Notional Hardness
230 N
Density
50 kg / m3
Properties
Flame Retardant

SUPERIOR HIGH DENSITY MEDIUM FIRM REFLEX 50 (PINK)

Luxury Relex 50  is a high-density, medium firm foam designed for superior support and durability. Ideal for premium seating and high-quality mattresses, this foam is perfect for deep-fill cushions and applications where long-lasting structure and resilience really matter. It holds its shape beautifully, delivering both comfort and strength over time.

Grade
REFLEX 50
Notional Hardness
135 N
Density
50 kg / m3
Properties
Flame Retardant

BUDGET LIGHTWEIGHT FOAM V28

This lightweight foam is a great choice for headboards, crafts, costumes, and a variety of general-purpose projects. It’s easy to work with and perfect for decorative or low impact uses. Just a heads-up: we don’t recommend this grade for seating or any application where it’ll need to support weight regularly.

Grade
V28
Density
28 kg / m3
Properties
Flame Retardant
Not Suitable For Seating

LIGHTWEIGHT PACKAGING FOAM RX28 (DARK GREY)

The RX28 is a medium-density foam perfect for upholstery, deep buttoning, and packaging, offering support and comfort.

Grade
RX28
Notional Hardness
150 N
Density
28 kg / m3
Properties
Flame Retardant

SOFT BACK CUSHION FOAM V24 (WHITE)

V25 is a soft, low-density foam perfect for replacing the back cushions of your sofa. It offers gentle support with a plush feel, helping restore comfort and shape without being too firm. Easy to work with and great for low-impact use, it’s a popular choice for giving tired cushions a fresh, cosy upgrade.

Grade
V24
Notional Hardness
65 N
Density
24 kg / m3
Properties
Flame Retardant
Highly Recommended Substitute for Fibre or Feather Back Cushions.

STANDARD MEDIUM SOFT RX30 (WHITE/LILAC)

RX30/110 Lilac Foam SheetA soft, flexible foam ideal for back cushions and headboards. Suitable for soft fixed backs or medium-feel loose back cushions & mattresses .Often chosen when a gentler, more cushioned option is needed. Note: This grade may occasionally be supplied in white, as it is manufactured in both Lilac and White.

Grade
RX30/110
Notional Hardness
110 N
Density
30 kg / m3

VASCO 50 MEMORY FOAM (WHITE/ YELLOW)

High-quality UK-made, heat-sensitive foam that softens and moulds to your body, offering pressure-relieving comfort. Commonly used in mattresses, toppers, pillows, wheelchair cushions, and medical products.

Grade
VASCO 50
Notional Hardness
65 N
Density
50 kg / m3
Properties
Flame Retardant

MEMORY FOAM (VASCO 60)

60 kg per cu/m high density memory foam.

Grade
VASCO 60
Notional Hardness
60 N
Room Temp. Hardness
60 N
Density
60 kg / m3

COOLING REVO 60KG MEMORY FOAM

Grade REVO Notional Hardness 60 N Medium firm (Atr) Density 60 kg / m3  Properties Flame Retardant  

Grade
REVO60
Notional Hardness
60 N
Room Temp. Hardness
60 N
Density
60 kg / m3

RX39 FIRM / MEMORY FOAM 1" (2.5cm) COMBO

This product is made by laminating RX38 firm blue foam with a 1″ layer of memory foam. It is essential that the total thickness (C) is greater than 1″. If you order this product at exactly 1″ thick, it will consist of memory foam only

Grade
RX39 / Memory Combo
Density
40 kg / m3
Properties
Flame Retardant

RX39 FIRM/ MEMORY FOAM (2") COMBO

This product is made by laminating RX38 firm blue foam with a 2″ layer of memory foam. It is essential that the total thickness (C) is greater than 2″. If you order this product at exactly 2″ thick, it will consist of memory foam only

Grade
RX39 / Memory Combo
Density
40 kg / m3
Properties
Flame Retardant

50/50 COMBO RX39 FIRM & MEMORY

50/50 RX39 Firm Foam & Memory Foam Combo A perfect blend of comfort and support — RX39 firm foam provides a solid base, while memory foam contours to the body for pressure relief. Ideal for dog beds, wheelchair seats, and pressure cushions where durability and comfort matter most.

Grade
RX39 / Vasco 50
Properties
Flame Retardant

MEDIUM FIRM REFLEX 40 / MEMORY 1" COMBO

IMPORTANT GRADE INFORMATION This product combines Reflex 40 medium foam with a 1″ layer of memory foam. If you order at 1″ thick, you’ll receive memory foam only — without the Reflex 40 support layer. To ensure proper comfort and support, the total thickness must be greater than 1″.

Grade
Reflex 40
Notional Hardness
135 N
Room Temp. Hardness
135 N
Density
40 kg / m3
Properties
Flame Retardant

MEDIUM FIRM REFLEX 40 / 2" MEMORY COMBO

IMPORTANT GRADE INFORMATION This product combines Reflex 40 medium foam with a 2″ layer of memory foam. If you order at 2″ thick, you’ll receive memory foam only — without the Reflex 40 support layer. To ensure proper comfort and support, the total thickness must be greater than 2″.

Grade
Reflex 40 H / v50
Notional Hardness
135 N
Room Temp. Hardness
135 N
Density
36 kg / m3
Properties
Flame Retardant

6LB RECONSTITUTED FIRM FOAM

Recon foam is a tough, contract-grade option made for high-impact use. It’s commonly used in wheelchair seating, church kneelers, bar stools, bench seating, and protective packaging. Known for its durability and density, perfect for applications that need extra firmness and longevity.

Grade
Recon 6lb
Notional Hardness
230 N
Density
95 kg / m3
Properties
Flame Retardant

10PPI RETICULATED FOAM

This is a special open-cell foam that lets air and water pass through easily. It’s highly resistant to moisture, making it perfect for things like water and air filters. It’s tough against chemicals, salt water, oils, soaps, and even fuel — so it’s great for industrial use. Common uses include water treatment, air filters, humidifiers.

Grade
10 PPI
Density
24 kg / m3
Properties
Not Fire Retardant (None F/R)
Colour Blue

30PPI RETICULATED FOAM

A durable, open-cell foam that resists water, humidity, and chemicals — ideal for outdoor seating and air/water filtration. Its breathable structure also makes it great for humidifiers, ventilation, and industrial filtration systems.

Properties
Not Fire Retardant (None F/R)
Perfect for Outdoor Seating

45PPI RETICULATED FOAM

Open-cell foam with excellent water and humidity resistance — perfect for filtration, outdoor use, and ventilation systems. It’s chemical-resistant, reusable, and supports microbial growth for environmental applications. Common uses: water/air filters, humidifiers, acoustic panels, and industrial treatment systems.    

Properties
Not Flame Retardant (None F/R)

Your Created Product

Measurements

Choose Foam Grade

FROM £4.00

Description

Triangle Foam Cut to Size – Precision Angles for Cushions, Props & More

Need a Triangle Foam Cut to Size,  cut exactly to size? Whether it’s for a corner seat, a display prop, or a custom upholstery job, we’ll cut your foam with CNC precision so every angle is sharp, clean, and exactly as you specify.

Made to order in the UK
Fire-retardant foam as standard
Fast dispatch – 3 working days (order before 11:00am Mon–Fri)


🎯 Perfect For:

  • Corner cushions for bay windows & seating areas

  • Backrests for angled seating

  • Campervan, caravan & boat seating with angled layouts

  • Stage & display props

  • Protective packaging for odd-shaped products

  • Art & craft projects needing geometric precision


📏 How to Measure for Triangle Foam

  1. (A) Base to Apex 

  2. (B) Base Width 

  3. (C) Thickness

💡 For perfect results, measure from the cover or baseboard — foam compresses over time and old pieces can be misleading.


🔍 Foam Grade Guide

Foam Grade Firmness Best For
RX24 White Soft-Medium Backrests, light-use seating
RX36 Pink Medium-Soft Domestic cushions
RX39 Grey Medium-Firm Daily-use seating & props
V38 Blue Extra Firm Heavy-duty seating & display structures
Memory Foam Soft-Supportive Comfort layers & ergonomic pads

✨ Optional Extras

🧵 Dacron Wrap – Smooths edges & adds comfort
🧦 Stockinette Sleeve – Easier fitting into covers

We’ll apply these for you — just tick the options at checkout.


🛠 FAQs – Quick Answers

Q: Can you make an equilateral or right-angled triangle?
A: Yes — we cut to any angle or triangle type you specify.

Q: Do I give measurements for the foam or the cover?
A: Always give the cover size — we make adjustments for extras.

Q: Can I get large foam triangles for props?
A: Absolutely — we cut from sheets up to 2.4m x 2m.


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Order in 3 Easy Steps:

  1. Enter your sizes

  2. Choose firmness

  3. Add extras & checkout

CNC Cut to Size
Fire Retardant
Fast UK Dispatch

 

MADE TO MEASURE CUSHION COVERS   Click here

 

www.thefoamshop.co.uk