Relyon Orthofirm Deluxe 800 Pocket King Size Mattress
The Relyon Orthofirm Deluxe 800 Pocket is a firm pocket spring mattress, handcrafted in the UK.
- Properly firm support
- Minimises partner disturbance
- Damask cover won't trap heat
£628
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Relyon Orthofirm Deluxe 800 Pocket Mattress
More available sizes
Mattress details
Mattress
Relyon Orthofirm Deluxe 800 Pocket Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Orthopaedic
Depth (cm)
23
Layers
4
Layer Details
Damask cover
A finely woven, durable fabric that feels soft to the touch and doesn't retain heat. That means a cooler surface than many synthetic covers, and one built to last.
Dual density white fibres
This layer offers a comforting embrace while reinforcing the firm feel, which means a little softness at the surface without undermining the support beneath.
Soft white fibres
Densely packed fibres that support the spring unit and increase the firm feel. In practice, this is what keeps the mattress feeling stable and consistent edge to edge.
Pocket springs
800 pocket springs, each in its own fabric pocket, so they move independently. You'll feel more responsive, localised support and less disturbance from a partner's movement.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- 75cm each for two sharing: The UK king gives 75cm each for two people sharing, which means room to change position without negotiating for space.
- Less disturbance at this width: 800 pocket springs move independently, so if one of you gets up hours before the other, the extra width makes their exit even less noticeable.
- 200cm of length: At 200cm long, the UK king suits anyone approaching six foot, whose feet would hang off a 190cm bed.
- Firm support edge to edge: Densely packed fibre layers keep the firm feel consistent across the full 150cm width, so neither sleeper drifts into a soft middle.
- A cooler surface for a shared bed: Two bodies generate more warmth than one, and the damask cover doesn't retain heat, which helps on a mattress this size.
This size suits you if...
You share the bed every night and want genuinely firm support with more personal space, one of you is up and out hours before the other and you're tired of feeling every movement, or one of you is tall enough that the 200cm length matters as much as the width.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king, or you mostly sleep alone. The UK small double would suit you better; allow at least 2.4m x 2.8m for it.
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FAQ's
How big is the Relyon Orthofirm Deluxe 800 in a UK king?
It measures 150 x 200cm, which is 5ft x 6ft 6in. That gives 75cm each for two people sharing, and the 200cm length is a genuine help if either of you is on the taller side. Fitted sheets are a UK king, and its 22.5cm depth means standard-depth sheets fit without a struggle.
What room size do I need for a UK king mattress?
We suggest at least 2.7m x 2.9m for a UK king, which leaves enough space to walk round the bed and open drawers. New build master bedrooms can be tighter than they first appear once wardrobes go in, so measure with the furniture in place, not the empty room.
Does the Relyon Orthofirm Deluxe come in a UK double?
No, there's no standard UK double in this range, which makes the UK king the natural choice for most couples. The UK double gives 67.5cm each for two sharing, so the UK king gives 7.5cm more each anyway. If space is tight, the UK small double is the step down.
Is the UK king Relyon Orthofirm good for couples on different schedules?
Yes, this is where it does well. The 800 pocket springs each sit in their own fabric pocket and move independently, so when one of you gets up early, the other feels far less of it. The 75cm each of a UK king adds physical distance on top, which helps just as much.
Is a UK king hard to rotate?
It takes two people. This mattress has no side handles, and at 150 x 200cm there's a lot of surface to grip, so plan to rotate it together rather than wrestling it alone. On the plus side, the firm fibre-and-spring build holds its shape while you move it.