Curved Quadrant Cushion Cover

Boxed & Piped Cushion with Foam & Dacron
Boxed & Piped Cushion with Foam & Dacron

How to Order Curved Quadrant Cushion Cover(Made Easy)

Pick Your Units – Choose whether you’re measuring in millimetres (mm), centimetres (cm), or inches (“) and enter your sizes
Need a New Inner? – Choose if you want us to supply a cushion interior or just the cover.
Add Extras (Optional) – Add Stockinette or Dacron wrap to make the cushion plumper and easier to fit.
Design Your Cover – Pick your cover style and answer a few quick questions.
Add Any Notes – Let us know anything extra (e.g. zip position, which side is the front).
Add to Cart – Once you’re happy, click Add to Cart.

Now Choose Your Fabric

Once your cover design is in the cart, you’re ready to choose your fabric.

Measurements

Measurements

Reference Image

choose your cushion filling

COVER ONLY (NO FOAM)

Use this option to create a cover to the sizes entered above

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

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

STANDARD MEDIUM FIRM MATTRESS FOAM RX36/125

Medium-density foam ideal for mattresses 4″ and above. It provides balanced support and comfort, making it a great choice for those seeking a medium-firm sleeping surface. Keep in mind—thicker mattresses offer more support than thinner ones, regardless of foam grade.

Grade
RX36/125
Notional Hardness
125 N
Room Temp. Hardness
125 N
Density
36 kg / m3
Properties
Comfort level: MEDIUM FIRM for mattresses above 4" (`10cm ) in thickness
Density: MEDIUM

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

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

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

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

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

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

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

FIBRE FOR BACKS, BOLSTERS & PILLOWS

Grade
100% Hollow Fiber

FIBRE FOR SEATS CUSHIONS

FOAM CORE FIBRE INTERIOR

This Foam core feather combination is best suited to those wanting a medium form seat  

Grade
REFLEX 40 H
Notional Hardness
135 N
Room Temp. Hardness
135 N
Density
40 kg / m3

FOAM CORE FEATHER (MEDIUM FIRM)

High density, medium firm foam Reflex 40h is a high-quality foam known for lasting comfort and support. Bounces back quickly and keeps its shape for years—perfect for as the core for a feather or fibre seat interior    

Grade
REFLEX 40
Notional Hardness
135 N
Room Temp. Hardness
135 N
Density
40 kg / m3

EUROPEAN 302 DE-QUILLED FEATHER

European 302 de -quilled for extra comfort

    FABRICS

    We offer a wide range or both Interior Upholstery Fabric & Exterior Water Resistant Fabric suitable for a marine environment. Customer can workout exactly the amount of fabric required per cushion, using the Fabric Calculator. You will only be able to add fabric to your order once you have sent the foam & cover order to the cart.   

Your Created Product

Measurements

choose your cushion filling

FROM £10.00

Description

Custom Curved Quadrant Cushion Covers – The Seamless Fit for Rounded Seating

Straight-edged cushions are easy enough — but when your seat has a curved, quarter-circle shape, you’re in a different league. Whether it’s the corner bench in your kitchen, a sweeping seat in your camper, or a curved cushion on a boat’s bow, a standard cover just won’t do the job.

That’s why we make Curved Quadrant Cushion Covers to order — carefully tailored to match the arc of your cushion, not fight against it. No bulges. No bunching. Just a smooth, fitted cover that follows the line of your seating perfectly.

So if you’ve got a rounded edge that’s a pain to cover, we’ve got the answer.


Shaped for the Curve – Cut to Fit, Not to Compromise

Quadrant cushions have one goal: to wrap neatly into corners without looking awkward. But they’re near impossible to cover properly using anything mass-produced.

That’s why we custom-make each cover, based on your exact measurements — including the radius of the curve, the overall depth, and the straight edge dimensions.

As a result, your new cushion cover will hug the arc tightly, flow neatly into the corner, and sit flat across the top — no twisting, warping, or creasing.


Choose a Style That Complements the Curve

Once you’ve nailed the fit, it’s time to style it up. Depending on where the cushion lives, and how formal or relaxed your setup is, you’ve got four great options:

  • Box Style – adds definition and structure to the shape
  • Box with Piping – gives a tailored, traditional feel

  • Each one is made to order, stitched by hand here in the UK by people who know their way around a tricky seam.


Fabric Choices for Indoors, Outdoors and Everywhere In Between

Now let’s talk about the look and feel. Whether your curved cushion sits by a window, in a camper corner, or out on the water, we’ve got the right fabric for the job:

  • For outdoor or marine cushions, our UV-resistant, water-repellent fabrics are ideal — tough, reliable, and built to cope with heat and damp

  • For indoor seating, you’ll find a full spread of comfy, stylish materials — from soft velvets to textured cottons and practical, wipe-clean synthetics

Want a double-sided design? No problem — we can use different fabrics on each side so you can flip it depending on your mood or the season.

Still deciding? We’ll send free fabric samples — so you can touch before you commit.


Need Foam Too? We’ll Shape That Arc to Match

Even if your cover looks the part, tired foam can let the whole thing down. That’s why we also offer custom-cut foam inserts for curved quadrant cushions — matching the radius and depth you need for a crisp, snug finish.

You can choose from:

  • High-density foam – firm and structured, perfect for supportive seating

  • Reflex foam – softer and more forgiving for relaxed areas

To top it off, we can wrap your foam in Stockinette or Dacron to plump it out and smooth the fit inside your new cover.


Smart Finishing Touches That Keep Things Tidy

Getting the curve right is only half the battle — keeping it in place is just as important. That’s why we offer a few extra options that make all the difference:

  • Choose your zip location for simple access

  • Add a non-slip base — perfect for boats or smooth bench seating

  • Include Velcro tabs, ties or fixings to hold everything neatly in place

And yes — every cover is fully removable and washable, so cleaning up is quick and easy.


Refresh, Don’t Replace

When the foam’s still good and the shape’s still right, why start from scratch? A new cover can give your curved quadrant cushion a fresh lease of life — without wasting money or creating unnecessary waste.

Especially for curved cushions, which are near-impossible to find replacements for, a custom cover is simply the smarter choice.


How to Order Your Curved Quadrant Cushion Cover – Fast, Easy, Accurate

We’ve made it easy to get a spot-on result the first time. Here’s what to do:

  1. Choose your units — mm, cm or inches

  2. Enter your cushion’s depth, radius, and straight edge measurements

  3. Pick your style and fabric, then add any extras

  4. Add special notes — zip placement, fabric combo, front-facing side, etc.

  5. Click “Add to Cart” — and we’ll get cracking

Need help with measuring? Just ask — we’ll walk you through it.


Why Foam4U?

At Foam4U, we specialise in shapes that other suppliers avoid. From curves and corners to cut-outs and slopes — we’ve seen (and covered) them all.

With a combination of traditional craftsmanship, precision tools, and years of hands-on experience, we produce covers that fit perfectly and last properly.

So whether it’s a bow seat, a camper corner or a window nook — your Curved Quadrant Cushion Cover is in safe hands.

Made to measure.
Made to match.
Made in the UK.

 

 

 

 

Our sister website www.thefoamshop.co.uk