RHF Diagonal Square / Rectangle Split Rounded Corner Mattress

How to order a RHF Diagonal Square / Rectangle Split Rounded Corner Mattress in 5 simple steps

  1.  Choose cm’s  mm’s or inches.
  2. Enter Your sizes in the boxes provided.
  3.  Choose foam grade from drop down menu.
  4.  Add a Cover as required.
  5. Review your order and add to cart.
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Measurements

Measurements

Reference Image

Choose Your Comfort Level

BUDGET MATTRESS FOAM (V28)

This lightweight foam is best suited for occasional-use only,  We wouldn’t recommend it for everyday use or situations where long-term support is essential. Keep in mind—thicker, higher-volume mattresses naturally offer more support than thinner ones, regardless of the foam grade.

Properties
Comfort Level : Not Specified ,
Density: MEDIUM/LOW
Recommendations: Occasional use only !

STANDARD FIRM MATTRESS FOAM RX33/190

This medium-density, firm mattress foam  Ideal for mattresses around 3–4 inches thick, offering reliable support and durability. Just a heads-up—it may feel a bit too firm for those who prefer a softer sleeping surface. Keep in mind—thicker, higher-volume mattresses naturally offer more support than thinner ones, regardless of the foam grade.

Grade
RX33/190
Notional Hardness
190 N
Density
33 kg / m3
Properties
Comfort Level : FIRM
Density: MEDIUM

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

ORTHOPAEDIC HIGH DENSITY MATTRESS FOAM RX39/200

Most popular High density firm foam mattresses. Best choice for cushions 3–4 inches thick. May be too firm for cushions above 5” in thickness.  Keep in mind—thicker mattresses offer more support than thinner ones, regardless of foam grade.

Grade
RX39/200
Notional Hardness
200 N
Density
39 kg / m3
Properties
Comfort level ; FIRM
Density; HIGH

COMFORT MEDIUM FIRM HIGH DENSITY MATTRESS FOAM RX41/150

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 mattress. Keep in mind—thicker mattresses offer more support than thinner ones, regardless of foam grade.

Grade
RX41/150
Notional Hardness
150 N
Density
40 kg / m3
Properties
Comfort level : MEDIUM FIRM for mattress over 4"(10cm ) in thickness
Density: HIGH

STANDARD MEMORY FOAM MATTRESS TOPPER SFV40

Incorporating Visco Elastic memory foam into your bedding solutions offers enhanced comfort and support, catering to various applications from home to travel.

Grade
SFV40
Room Temp. Hardness
60 N
Density
40 kg / m3
Properties
Comfort Level: SOFT
Density : HIGH

COOLING GELFLEX MEMORY FOAM MATTRESS TOPPER

GelFlex memory foam is a modern, gel-infused foam designed for mattress toppers where cooler sleep matters.It provides pressure-relieving comfort with a more responsive feel than traditional memory foam.The gel infusion helps reduce heat build-up, making it ideal for warmer sleepers.Perfect for upgrading comfort without creating an overly soft or sink-in feel.

Density
50 kg / m3
Properties
Comfort Level : MEDIUM
Density : HIGH

ORTHO MEMORY FOAM MATTRESS COMBO RX39/200 BASE WITH 1" (2.5CM) MEMORY

Firm V38 base foam bonded to 1″ of Vasco 50 memory foam softens the feel, of the mattress, making what would typically be a firm mattress more comfortable.  Keep in mind—thicker, higher-volume mattresses naturally offer more support than thinner ones, regardless of the foam grade.

Properties
Comfort level : FIRM
Density; HIGH
Minimum Mattress Thickness : Must be over 2" (5cm ) or only memory foam element will be supplied

ORTHO PLUS MEMORY FOAM MATTRESS COMBO RX39/200 BLUE BASE TOPPED WITH 2" (5CM) MEMORY

Firm V38 base foam bonded to 2″ of Vasco 50 memory foam softens the feel, of the mattress, making what would typically be a firm mattress more comfortable.  Keep in mind—thicker, higher-volume mattresses naturally offer more support than thinner ones, regardless of the foam grade.

Properties
Comfort Level; FIRM/MEDIUM
Density; HIGH
Minimum Mattress Thickness : Must be over 2" (5cm ) or only memory foam element will be supplied

COMFORT MEMORY FOAM MATTRESS COMBO RX41/150 BASE TOPPED WITH 1" (2.5CM ) MEMORY

Comfort memory foam mattress combo featuring a supportive Reflex 40 grey base topped with 1″ (2.5cm) of plush memory foam for added pressure relief and comfort.

Grade
RELEX 40 /150
Notional Hardness
150 N
Density
40 kg / m3
Properties
Comfort Level : MEADIUM FIRM
Density: HIGH
Minimum Mattress Thickness : Must be over 1" (2.5cm ) or only memory foam element will be supplied

COMFORT PLUS MEMORY FOAM MATTRESS COMBO RX41/150 BASE TOPPED WITH 2" (5CM ) MEMORY

Comfort Plus Mattress Combo features a supportive Reflex 40 grey foam base topped with 2″ (5cm) of pressure-relieving memory foam.Offers the perfect balance of firm support and plush comfort for a restful night’s sleep.  Ideal for everyday use, guest beds, or custom spaces like campervans and caravans.

Grade
REFLEX 40/150
Notional Hardness
150 N
Density
40 kg / m3
Properties
Comfort Level: MEDIUM FIRM
Density: HIGH
Minimum Mattress Thickness : Must be over 2" (5cm ) or only memory foam element will be supplied

ULTRA FIRM MATTRESS FOAM RG50/230

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

GELFEX ORTHO FIRM

GelFlex Ortho Firm combines a 2″ (5 cm) layer of GelFlex gel-infused memory foam for cooling comfort and pressure relief.with our firmest high-density RX33/190 foam base for maximum support and stability assuming orders over 5cm 🔴 Firm – Maximum support for back & stomach sleepers

Grade
Gelflex + 33/190

GELFLEX MEDIUM

GelFlex Medium-Firm combines a 2″ (5 cm) layer of GelFlex gel-infused memory foam for cooling comfort and pressure relief.  & high-density medium-firm 41/150 foam base for stronger support and improved weight distribution, assuming orders over 5cm thickness 🔵 Medium (Most Popular) – Balanced support for back sleepers & couples

Grade
Gelflex + 41/150

GELFLEX SOFT

GelFlex Soft combines a 2″ (5 cm) layer of GelFlex gel-infused memory foam for cooling comfort and pressure reliefwith a high-density medium-soft RX39/120 foam base for stable, long-lasting support, assuming orders over 5cm thickness 🟢 Soft – Plush, contouring comfort for side sleepers  

Grade
Gelflex + 39/120
  • Two mattress sections joined using a flexible fabric hinge, allowing the mattress to fold while remaining aligned in use.

  • Tencel mattress with breathable cover and cooling design Tencel mattress with a naturally breathable cover designed to help regulate temperature and improve sleep comfort.

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  • Recommend Upgrade

    Why upgrade to GelFlex?

    GelFlex is gel-infused cooling memory foam engineered for better sleep

    • ❄️ Sleeps cooler than standard memory foam

    • 🛌 Relieves pressure on hips, shoulders & back

    • 📐 Improves spinal alignment in any sleeping position

    • ✂️ Made to measure — any size, any shape

    GelFlex Memory foam


     

Your Created Product

Measurements

Choose Your Comfort Level

FROM £69.99

Description

RHF Diagonal Square / Rectangle Split Rounded Corner Made to Measure Mattress – Custom Built to Your Specification

This mattress is custom made to measure in the UK, built to your exact dimensions and configuration for a precise fit.

Designed for right-hand front (RHF) diagonal square / rectangle split layouts with a rounded corner, this mattress combines a rectangular sleeping surface, a diagonal cut for access, and a softened curved edge, all built into a multi-section split design.

Each section is manufactured to your individual specification, ensuring accurate alignment across the full mattress with no gaps, movement or misfit when in use.


📏 Is This the Right Mattress Shape?

This option is suitable if your mattress:

✔ Is made up of two or more sections (split design)
✔ Includes a diagonal cut on the right-hand front corner
✔ Features a rounded or softened corner within the shape
✔ Needs to fold, lift or move with the bed base

Common applications include:

  • Campervan rock and roll beds
  • Motorhome lift-up storage beds
  • Caravan hinged bed bases
  • Boat cabin mattresses built in sections

If your mattress needs to move with the bed structure while fitting a complex layout, this is the correct option.


⚠️ When This Product Is NOT Suitable

This option is not suitable if your mattress:

✖ Is a single-piece mattress
✖ Does not need to fold or lift
✖ Requires only a simple diagonal or rounded shape

If your mattress is fixed, a standard shaped mattress will be more suitable.


🔄 Built for Folding, Lifting & Multi-Section Layouts

Split mattresses are used where access to storage or bed mechanisms is required.

A made to measure split mattress allows you to:

  • Lift or fold sections without removing the mattress
  • Maintain alignment across all sections
  • Improve usability in everyday use

This is essential for layouts where the bed is part of a multi-use living space.


🧩 Why This Hybrid Split Design Is Used

This design combines:

  • A rectangular base for maximum sleeping area
  • A diagonal cut to improve access
  • A rounded corner to remove sharp edges
  • A split construction for movement and flexibility

This allows the mattress to:

  • Work with folding or hinged systems
  • Improve access in tight interiors
  • Maintain a comfortable, usable sleeping surface

It’s a complete solution for both shape and function.


🧠 Choosing the Right Comfort Level

With a split mattress, consistency across all sections is critical.

High Density Reflex Foam
Provides firm, stable support across each section.

Memory Foam (SFV50 Premium Grade)
Adds comfort and pressure relief across the full surface.

GelFlex Foam
A gel-infused foam designed to improve cooling and provide enhanced pressure relief, helping regulate temperature in warmer conditions.

All options are available in multiple firmness levels.


🛏️ Removable Covers for Split Mattresses

All mattresses are available with removable, washable covers, designed specifically for split configurations.

✔ Made to match each section
✔ Designed to move with folding layouts
✔ Durable and practical for regular use


💧 Managing Condensation & Airflow

In enclosed environments such as campervans, motorhomes, caravans and boats, airflow beneath the mattress is important.

Using an Airmat Spacer Mesh helps improve ventilation and reduce moisture build-up across all sections.


🔧 Typical Applications

This type of mattress is commonly used for:

It is best suited to layouts where both movement and shaping are required.


➕ Optional Add-Ons

You can enhance your setup with:


🇬🇧 Made to Measure in the UK

Every mattress is manufactured in the UK and built to your exact specification, ensuring a precise fit across all sections.


📞 Need Help?

If you’re unsure how to measure a split mattress or whether this configuration is correct, get in touch before ordering.

We’ll help you choose the right setup.

 

 

Our sister website www.thefoamshop.co.uk