RHF Straight Mitred Corner Back Cushion Cover

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

How to Order RHF Straight Mitred Corner Back 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

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 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

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

EUROPEAN 302 DE-QUILLED FEATHER

European 302 de -quilled for extra comfort

    Before you order fabric Please send your design to the basket then order fabric 

Your Created Product

Measurements

choose your cushion filling

FROM £10.00

Description

Custom RHF Straight Mitred Corner Back Cushion Covers – A Perfect Fit for Awkward Corners

If you’ve got a cushion that turns at a right-hand angle with a mitred back corner, then you already know: standard cushion covers won’t cut it. Whether it’s the snug backrest on your built-in dining bench, a curved motorhome seat, or that infuriatingly awkward back cushion on your boat — you need a tailored solution.

That’s why we offer made-to-measure RHF Straight Mitred Corner Back Cushion Covers — expertly crafted to your exact measurements, with every angle, edge, and cut tailored to fit just right.

So whether you’re finishing off a fitted L-shaped corner, upgrading your saloon seating, or modernising a static bench, this is the cover that’ll do it justice.


Tailored for the Tricky Bits – Because Fit Matters

Mitred back cushions, especially on a right-hand-facing (RHF) setup, come with their own set of challenges. They’re not square. They’re not rectangular. They’re a blend of angles, tapers and precise joins — and they deserve a proper fit.

Instead of guessing, we cut your RHF mitred back cushion cover to your exact specifications. That includes every corner, taper, and mitre — so the cover hugs the shape perfectly, sits cleanly, and doesn’t need constant adjusting.

In comparison to off-the-shelf options, our custom work gives you a crisp, professional finish — no creases, no gaping, no fiddling.


Choose the Right Style for Your Space

Of course, once you’ve nailed the fit, the next step is finding the right look. That’s where our range of bespoke cover styles comes in. Each one brings a different tone and texture to your space:

  • Wrap Style – simple, sleek, and modern

  • Box Style – clean lines and defined edges

  • Box with Piping – classic upholstery style, adds detail and polish

  • Box Pleat Style – ideal for a more traditional or heritage look

And just like the cushion itself, each cover is cut and sewn by hand here in the UK — using high-quality materials and traditional techniques.


Durable, Stylish Fabrics for Every Environment

Now that you’ve picked your style, let’s talk fabric. Because RHF corner cushions often live in high-use areas, the right material matters.

  • For outdoor, marine or mobile setups, we recommend our UV-resistant and water-repellent fabrics — built to survive heat, humidity and movement.

  • For indoor seating, we offer plush velvets, tactile cottons, and easy-care weaves in a variety of colours and textures.

Even better, you can go reversible — choose a different fabric for each side, and flip your look when the mood takes you.

Not sure what suits your space? Request a free fabric sample — we’ll send it straight out so you can see and feel before you commit.


Need New Foam? We’ll Cut That to Fit Too

A new cover’s great — but not if your foam has gone flat. That’s why we also supply foam cut to match your RHF straight mitred cushion exactly.

Choose from:

  • High-density foam – for firm, supportive backrests

  • Reflex foam – for a bit more comfort and give

In addition, we offer Stockinette or Dacron wrapping, which gives your cushion a fuller, plumper shape — and makes inserting it into the cover much easier.


Clever Add-Ons for a Cleaner Finish

We know it’s not just about the big stuff — the little touches matter too. That’s why we offer optional extras to make your custom cushion cover even more functional:

  • Select your zip position for easy fitting and removal

  • Add a non-slip base — especially useful in boats, motorhomes, or busy homes

  • Choose Velcro tabs, fabric ties, or fasteners to keep the cushion exactly where it belongs

And of course, all covers are fully removable and washable — so staying clean is a doddle.


The Smart, Sustainable Choice

Let’s be honest: ditching a good cushion just because the cover’s had it isn’t smart — it’s wasteful. Especially when it’s a shaped cushion that’s hard to replace.

Instead of starting over, a custom-made RHF straight mitred cushion cover lets you keep what works, and refresh what doesn’t.

It’s more affordable. It’s more sustainable. And frankly, it’s more sensible.


How to Order Your RHF Straight Mitred Corner Back Cushion Cover

We’ve made ordering easy. No confusion, no back-and-forth — just follow these simple steps:

  1. Select your unit of measurement — mm, cm or inches

  2. Enter your cushion’s dimensions, including lengths, widths, depths, and layout shape

  3. Choose your style, preferred fabric, and any extras

  4. Add specific instructions — such as zip location, which side faces front, or if you’d like reversible fabric sides

  5. Click “Add to Cart” — and we’ll take it from there

If you’re not sure about measurements, fabrics, or extras — just give us a call or email. We’re happy to guide you.


Why Choose Foam4U?

At Foam4U, we don’t believe in “close enough.” We believe in properly made, precision-fit cushion covers that do what they’re supposed to — and last the distance.

We bring together traditional upholstery skill, modern techniques, and high-quality materials to deliver exactly what your RHF straight mitred corner back cushion needs.

So whether you’re refreshing a boat saloon, fitting out a custom camper, or revamping a bench seat — we’ve got it covered.

Made to measure.
Made in the UK.
Made properly.

Our sister website www.thefoamshop.co.uk