Healthopaedic Zero Gravity Orthoflex Mattress – Firm
From £499.00 Original price was: £499.00.£299.00Current price is: £299.00.40% off
or from £25/month
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Klarna.
Clearpay
T&Cs
Free delivery
5 to 10 working days
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- Durable and supportive Acticoil springs
- Luxury Zero Gravity sleeping surface
- Encapsulated sides for extra edge support
- Medium/Firm feel
- 25cm deep
14-Day Returns (Standard Orders)
Fast delivery 3-10 Days
24-Month Warranty Included
Firm orthopaedic mattress
Firm, level support that keeps you on top of the mattress, not sinking into it
The Zero Gravity Orthoflex Firm is for people who know they sleep better on a firm mattress. A heavy-gauge Acticoil orthopaedic spring unit does the supporting, a Zero Gravity comfort layer spreads your weight so your shoulders and hips are not pressed hard into the springs, and encapsulated sides keep the edge as firm as the middle.
25 cm deep, available in five UK sizes, with free UK mainland delivery and a 24-month warranty.
Orthopaedic spring unit
Pressure-relieving comfort layer
Encapsulated edges
25 cm deep
How it feels
Firm
Firm and level. You lie on the mattress rather than in it, your spine stays in a straight line, and turning over in the night takes no effort. The comfort layer takes the hard edge off the springs, so it feels supportive rather than like lying on a board.
✓ Great match
Back sleepers
Keeps the lower back supported and the spine level.
✓ Great match
Front sleepers
Stops the hips dipping, so your back does not arch.
✓ Great match
Heavier sleepers
Heavy-gauge springs hold their shape under more weight.
Good match
Side sleepers
If you like firm. Lighter side sleepers may prefer a Medium.

Inside the mattress
Three parts, one job: firm support that stays comfortable
Smooth, soft to the touch
Spreads your weight, eases pressure points
Heavy-gauge springs, firm all-over support
Encapsulated edge support, all the way round
Acticoil orthopaedic springs. The core is a fully orthopaedic spring unit made with heavy-gauge springs. Heavier gauge means a firmer spring that pushes back evenly across the whole mattress, so your hips and shoulders are held level with the rest of your body instead of sinking below it.
Zero Gravity comfort layer. A layer above the springs spreads your body weight over a wider area. That takes the pressure off the points that carry the most load: your shoulders, hips and lower back. You still feel the firm support underneath, just without the hard spots.
Encapsulated edges. The sides are reinforced all the way round, so the border carries weight like the centre. Sit on the edge to get dressed and it holds; sleep near the side and you will not feel like you are rolling off.
25 cm deep. Enough depth for the springs and comfort layer to work properly, and it fits standard deep fitted sheets.
Why customers choose it
The details that matter
Firm
Orthopaedic support
Heavy-gauge springs keep you level from head to toe.
Less
Pressure on joints
The comfort layer spreads your weight across the surface.
Edge
To edge support
Encapsulated sides make the whole width usable and stop sagging.
24
Month warranty
Two full years of cover, with free UK mainland delivery.
Sizes and specification
Single, small double, double, king size and super king
| Mattress size | Width | Length | Depth |
|---|---|---|---|
| Single mattress (3ft) | 90 cm | 190 cm | 25 cm |
| Small double mattress (4ft) | 120 cm | 190 cm | 25 cm |
| Double mattress (4ft 6in) | 135 cm | 190 cm | 25 cm |
| King size mattress (5ft) | 150 cm | 200 cm | 25 cm |
| Super king mattress (6ft) | 180 cm | 200 cm | 25 cm |
Feel: Firm. Best for back sleepers, front sleepers and heavier sleepers.
Construction: Acticoil orthopaedic spring unit with heavy-gauge springs, Zero Gravity comfort layer, quilted sleep surface, encapsulated edge support.
Depth: 25 cm. Standard deep fitted sheets (up to 30 cm) fit well.
Care: Rotate head to toe every few months so the mattress wears evenly.
Fits: All PSCL Beds frames, divan bases and ottoman beds in the matching size. On a slatted base, slats should be no more than 7 cm apart.
Tolerance: Mattress sizes can vary by around 2 cm. This is normal and will not affect fit on a correctly sized bed.
Not sure firm is right?
Find your feel
Every mattress in our range sits somewhere on the same scale. If you share a bed, choose for the person who needs more support.
Soft to Medium
MTRS® Atomic Comfort 3000
For side sleepers who like to sink in a little.
Firm · You are here
Zero Gravity Orthoflex Firm
Firm orthopaedic support at 25 cm deep.
Firm, deeper
MTRS® Hybrid Dynamics 2000
Firm hybrid with 2,000 pocket springs, 31 to 33 cm deep.
Complete the bed
Pair it with a bed handmade in Yorkshire
Ottoman storage beds
A firm mattress keeps its shape when the base lifts, which makes it a natural partner for a gas-lift ottoman.
Upholstered bed frames
Choose your frame and fabric, add a mattress in the frame’s options, and both arrive together.



Good to know
Firm orthopaedic mattress questions, answered
How firm is it?
It sits at the firm end of our range. You will lie on top of it rather than sink in, and the comfort layer stops it feeling hard. If you like to feel cradled, a Medium will suit you better.
What does orthopaedic mean on a mattress?
It describes a firmer mattress built to keep your spine in a straight, natural line while you sleep. Here that comes from heavy-gauge springs that resist sagging, with a comfort layer on top so the firmness does not press into your shoulders and hips.
Is a firm mattress good if I wake up with a stiff back?
Many people who wake up stiff on a soft or worn mattress find a firmer surface more comfortable, because it stops the hips sinking and keeps the back level. Everyone is different, so if you have an ongoing back condition, ask your GP or physiotherapist what they recommend.
Is it suitable for side sleepers?
Yes, if you prefer a firm feel. Side sleepers who are lighter, or who like their shoulder to sink in, usually find a Medium more comfortable. See Find your feel above to compare.
Will it fit my bed frame, divan or ottoman bed?
Yes. It suits slatted frames, solid bases, divans and gas-lift ottoman beds. Choose the mattress size that matches your bed. On a slatted base, slats should be no more than 7 cm apart.
What fitted sheets do I need?
The mattress is 25 cm deep, so standard deep fitted sheets (up to 30 cm) fit well.
How long is delivery and what does it cost?
Delivery to UK mainland is free and usually takes 5 to 10 working days. You can also choose a later delivery date if that suits you better. Buying a bed too? Add the mattress in the bed’s options and they arrive together.
What is the warranty and can I return it?
The mattress carries a 24-month warranty against manufacturing faults. Standard orders can be returned within 14 days, provided the mattress is unused and still in its original packaging, as a mattress that has been slept on cannot be resold for hygiene reasons.
Ready for firmer, better supported sleep?
Pick your size above and check out in under a minute.
✓ 24-month warranty
✓ 0% finance with Zopa Bank, Klarna and Clearpay
✓ Rated excellent on Trustpilot
| Mattress Size | Double 135 x 190cm, King Size 150 x 200cm, Single 90 x 190 cm, Small Double 120 x 190cm, Super King 180 x 200cm |
|---|---|
| Mattress Firmness | Firm |
Bed Frame Dimension Guide
Step 1: Determine Bed Size
Identify the size of the bed you have chosen (Single, Small Double, Double, King, or Super King).
Step 2: Headboard Dimensions
The headboard height is listed above. If an increase is needed, adjust accordingly as specified by us.
Headboard Measurements are Height x Width x Depth - (Most of the headboards are between 13cm and 25cm including the wings)
Step 3: Width and Length
Use the specified width and length for your chosen bed size from the dimensions table provided on the product page.
Step 4: Base Height
Choose the type of base you have:
- Normal Base: 25 cm
- Slatted Ottoman Base: 30 cm
- Divan Ottoman Base: 33 cm
Step 5: Footboard Height
The footboard height is consistent across all bed sizes and types of bases at 50 cm.
Divan Ottoman Bases:

Summary
By following these steps, you can accurately determine the individual dimensions for each part of your bed frame. This ensures proper fitting and assembly of your bed. If further customization is required, please refer to additional specifications or consult with the manufacturer.
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Healthopaedic Zero Gravity Orthoflex Mattress - Firm
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Heaithopaedic Zero