Firmness
Extra Firm
Type
Pocket Spring
Depth (cm)
32
Number of Layers
7
Trial Period (nights)
100
Warranty (years)
10
Price Range
£578 to £998
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Choose the Heyford Ortho 1500 if firm support is your priority. The 1500 pocket springs move independently, which means the mattress responds to each sleeper separately and limits the ripple effect when a partner moves. Above the springs sit layers of cotton and polyester fibres rather than foam, so air moves through more freely, a genuine help if you're a hot sleeper. Relyon is a National Bed Federation approved brand and the mattress is handcrafted in the UK, with a 10 year guarantee listed by the retailer. The feel is uncompromising, but for heavier builds or anyone advised to sleep firmer, that's the point. Owner ratings sit at 4.8 from 46 reviews on mattressonline.co.uk.
Key Features & what's inside
- Damask cover. A finely woven damask fabric, which means a soft-touch surface that doesn't trap heat. It's a durable weave built for long-term use.
- Soft white fibres. Two layers of soft white fibres sit just beneath the cover to improve breathability. In practice, this helps the mattress feel fresher through the night.
- Cotton and polyester blend. A breathable blend of natural cotton and polyester that wicks moisture away from you. This keeps air circulating rather than building up warmth.
- Rebound polyester and cotton fibres. A further layer of rebound polyester and cotton fibres adds a touch of comfort. It softens the surface slightly without compromising the firm feel.
- Dense polyester layer. A dense polyester layer that reinforces the firm, orthopaedic character of the mattress. This is where much of the extra firm feel comes from.
- Spring insulation pad. An insulation pad sits between the comfort layers and the springs. It protects the spring unit and adds durability over the years.
- Pocket springs. 1500 pocket springs, each secured in its own fabric pocket so they move independently. That means support tailored to your shape and less disturbance from a restless partner.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
This isn't a mattress for lightweight side sleepers or anyone who likes a plush, cushioned feel. Extra firm surfaces can press on shoulders and hips if you sleep on your side, and there's no memory foam hug here. If you want softness with your support, look at a medium firm option instead.
Relyon Heyford Ortho 1500 Pocket Mattress
View all mattresses
How firm is the Relyon Heyford Ortho 1500?
It's rated extra firm, the top end of the firmness scale. Expect a solid, orthopaedic feel with minimal sink. That suits back and front sleepers and heavier builds, but lightweight side sleepers may find it a little too unyielding.
Does the Relyon Heyford Ortho 1500 come with a trial period?
Mattress Online lists a 100-night trial with this mattress, but it's the retailer's own offer rather than Relyon's, and it requires buying a mattress protector from MattressOnline. If you buy elsewhere, check that retailer's terms, as they may differ.
What guarantee does the Relyon Heyford Ortho 1500 have?
The retailer listing states a 10 year guarantee. As with any guarantee, keep your proof of purchase and check the terms with the retailer you buy from.
How deep is the Relyon Heyford Ortho 1500 mattress?
It's 32cm deep, which is on the deeper side, so check your fitted sheets will stretch to accommodate it. Extra-deep sheets are usually the safer choice at this depth.
Is the Relyon Heyford Ortho 1500 good for hot sleepers?
It should sleep reasonably cool. The comfort layers are cotton and polyester fibres rather than foam, and the damask cover doesn't retain heat, so air circulates more freely than it would through a memory foam mattress.
Couldn't find an answer to your question? Send us a message