Square / Rectangle Mattress

How to order a Square Rectangle 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 if required.
  5. Review your order and add to cart
Custom shape fitted sheet being fitted onto a shaped campervan mattress with elasticated corner
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Measurements

Measurements

Reference Image

Choose 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

AIRFLOW COMBO

AIRFLOW COMBO- Base layer V38 firm, Mid layer high density castellated foam, Top layer Vasco 50 high density memory foam, THIS PRODUCT IS UNSUITABLE FOR MATTRESSES UNDER 17CM THICK.

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

    Add a drawing if required 

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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 Comfort Level

FROM £3.00

Description

Square & Rectangle Made to Measure Mattress – Custom Built to Your Specification

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

Designed for square and rectangular layouts, it is the most straightforward option for replacing or upgrading a mattress where a clean, straight-edged shape is required.

Whether used in a campervan, motorhome, caravan or boat, each mattress is manufactured to your individual specification, ensuring a consistent fit with no gaps or overhang.


📏 Is This the Right Mattress Shape?

This option is suitable if your mattress:

✔ Has four straight sides
✔ Fits a square or rectangular base
✔ Does not require shaping around obstacles

Common applications include:

  • Fixed bed layouts in campervans and motorhomes
  • Caravan bed platforms
  • Boat cabin sleeping areas
  • Simple, straight-edged custom builds

If your layout is uniform and unobstructed, this is the correct shape.


⚠️ When This Product Is NOT Suitable

This option is not suitable if your mattress:

✖ Requires angled corners
✖ Includes cut-outs or notches
✖ Needs shaping around furniture or walls

In these cases, a cutaway or custom shape mattress will be required.


🔄 Built for Replacement & Upgrade Projects

Square and rectangular mattresses are the most common format used for replacement projects due to their simple, uniform design.

A made to measure mattress allows you to upgrade your existing setup while maintaining the original layout, improving both fit and overall comfort.


🧩 Why Straight-Edged Mattresses Are the Most Common

Straight-edged mattresses provide a full, uninterrupted sleeping surface and make the best use of available space.

They are easier to measure, manufacture and replace, which makes them the preferred option across a wide range of vehicle and marine interiors.


🧠 Choosing the Right Comfort Level

Because the entire surface is used for sleeping, selecting the correct foam is important.

High Density Reflex Foam
Firm, supportive and suitable for regular use.

Memory Foam (SFV50 Premium Grade)
Adds a softer, more comfortable surface feel.

Gelflex Memory Foam
Breathable, responsive and long-lasting.

All options are available in a range of firmness levels.


🛏️ Removable Covers for Practical Use

All mattresses are supplied with removable, washable covers, designed for real-world use.

✔ Easy to remove and clean
✔ Durable for regular use
✔ Suitable for compact environments


💧 Managing Moisture & Airflow

In enclosed spaces such as vehicles and boats, airflow is important.

Using an Airmat Spacer Mesh beneath your mattress helps improve ventilation and reduce moisture build-up.


🔧 Typical Applications

This type of mattress is commonly used for:

  • Replacement mattresses in campervans, motorhomes and caravans
  • Boat cabin mattress upgrades
  • Custom built sleeping platforms

It is best suited to layouts where a full-width, uninterrupted surface is 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 and reliable fit.


📞 Need Help?

If you’re unsure whether this is the correct shape or how to measure your space, get in touch before ordering.

We’ll help you choose the right option.


 

 

Our sister website www.thefoamshop.co.uk

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