Design Your Own Mattress

How to Design Your Own Mattress in 5 simple steps

  1. Choose cm’s  mm’s or inches.
  2. Enter Your sizes in the boxes
  3. Choose a foam grade.
  4. Add a Cooltech or Tencel cover
  5. Review your order and add to cart.
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DIY custom mattress made to measure for campervan boat or home bed

Measurements

Measurements

Reference Image

Foam Grade

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 VASCO 50

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

Properties
Comfort Level: SOFT
Density : HIGH

COOLING REVO MEMORY FOAM MATTRESS TOPPER

This advanced memory foam is designed to provide exceptional comfort and support while keeping you cool throughout the night. Infused with cooling gel technology, it helps regulate temperature, preventing heat buildup and ensuring a restful sleep. Ideal for those who prefer a plush, breathable sleeping surface with enhanced pressure relief.

Properties
Comfort Level : SOFT
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
  • MATTRESS COVER OPTIONS

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Your Created Product

Measurements

Foam Grade

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Description

🛏️ DIY Mattress & Custom Size Mattresses – Made to Fit, Built to Last

Standard mattresses are built to standard sizes. Real homes, campervans, boats and DIY projects rarely are. The solution Design Your Own Mattress.

If you’re dealing with an awkward space, unusual dimensions, or simply want better control over comfort, a DIY mattress or custom size mattress gives you a made-to-measure solution without compromise.

With Foam4U, you design the mattress. We cut it precisely to your measurements — accurately, reliably, and made in the UK.

✂️ Design a Custom Mattress to Fit Your Space

A custom mattress puts you back in control.

Instead of choosing the “closest size available”, you specify the exact dimensions you need. Whether it’s a mattress custom size for a campervan, a boat bunk, a loft bed or a built-in frame, this system lets you create a mattress that fits perfectly — first time.

No trimming. No gaps. No wasted space.

🧠 What Is a Custom Made Mattress?

A custom made mattress is built specifically for your space and comfort requirements, rather than factory-set dimensions.

You choose:

  • 📏 Exact length, width and depth

  • 🪵 Your preferred level of support

  • 🛠️ A build suited to how and where the mattress will be used

The result is a custom size mattress that fits properly and performs exactly as it should.

✅ Why Choose a DIY Mattress?

🧩 Perfect for Non-Standard Spaces

A DIY mattress is ideal for:

  • 🚐 Campervans and motorhomes

  • 🚤 Boats and narrow cabins

  • 🏡 Built-in beds and alcoves

  • 🪑 Daybeds and DIY furniture projects

If a standard mattress doesn’t fit — this will.

🛌 Comfort Built Around You

With a custom mattress, comfort isn’t guesswork. Choose:

  • Firm, medium or softer support

  • Memory foam, reflex foam or layered builds

  • Depths to suit slatted bases, platforms or solid boards

You get the comfort you want — not whatever happens to be on the shelf.

💷 Cost-Effective Without Cutting Corners

A DIY mattress doesn’t mean DIY quality.

By going custom, you avoid paying for branding, retail mark-ups and unnecessary features. Instead, you’re paying for high-quality foam, accurate cutting and UK-based manufacturing — the things that actually matter.

🚐 Custom Mattresses for Real-World Use

Our custom mattresses are commonly made for:

  • Campervans, caravans and motorhomes

  • Boats and marine sleeping areas

  • Home renovation and built-in furniture projects

  • Replacement mattresses for older or unusual bed frames

If you can measure it, we can make it.

🔁 You May Also Like

Customers designing a custom mattress often choose these products to complete their setup or fine-tune comfort:

💤 Custom Memory Foam Toppers

Ideal for adjusting comfort after purchase. A popular add-on if you want extra pressure relief or the flexibility to fine-tune firmness — especially useful for campervans, boats and bespoke beds.

🛏️ Memory Foam Pillows & Scatter Cushions

Complete your sleep setup with supportive memory foam pillows and cushions designed to improve posture, comfort and overall sleep quality.

🛡️ Mattress Covers

Protect your custom mattress from spills, dust and everyday wear. A simple addition that helps extend mattress life and keep things hygienic.

📏 Bed Extender

Perfect if your bed feels a little short. A bed extender works seamlessly alongside a custom mattress — ideal for taller sleepers and campervan or boat layouts.

👉 All prices include VAT.

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