Harrison Spinks Diamond 25000 Pocket Mattress (Soft to Medium Feel)
The Harrison Spinks Diamond 25000 is a pocket spring mattress with a soft to medium feel, handcrafted in the UK and filled with natural materials including British wool, cashmere, mohair, hemp and flax.
- Foam-free, all-natural fillings
- Precise, targeted pressure relief
- Wicks moisture for cooler, drier nights
£2,049
Get the lowest price we've found
Beneath the Harrison Spinks Diamond 25000's fillings sit 24,300 mini springs and 700 of Harrison Spinks' Cortec Quad springs, which means support adapts closely to your shape rather than pushing back in broad zones. At 32cm deep it's a substantial mattress, and the retailer listing describes a double-sided design with a summer sleep surface for seasonal turning. It sits firmly at the luxury end. It suits sleepers who want natural fillings and gentle, cushioned support, although those needing a firmer surface should look elsewhere.
Mattress specifications
Firmness
Medium Soft
Type
Pocket Spring
Depth (cm)
32
Number of Layers
7
Trial Period (nights)
100
Warranty (years)
5
Price Range
£2,049 to £3,929
Best Sleeping Position(s)
Side Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This mattress makes sense if natural materials matter to you. There's no foam in the layer list: instead you get cotton, hemp, flax, British wool, mohair and cashmere, fillings that breathe and wick moisture, which means less of the clammy warmth some synthetic mattresses trap. The spring system is unusually intricate, with 24,300 mini springs above 700 Cortec Quad springs, each group of four secured within one fabric pocket, so pressure relief feels precise rather than general. It's a National Bed Federation Approved Brand and the mattress conforms to BS7177: 2008 for home use. Yes, the price is high, but the depth, handcrafting and quality of fillings go some way to justifying it. Mattress Online lists a 100-night trial and a 5-year guarantee.
Key features & layer details
Comfort Layer - Top Surface (Summer Side)
The summer side puts moisture wicking cotton closest to you. In practice that means a cooler, drier feel on warm nights.
Comfort Layer - Moisture Wicking Blend
Further layers of cotton, hemp and flax fibres draw moisture away from your body. This adds to that refreshing feel rather than letting heat and dampness build up.
Comfort Layer - Breathability Blend
A blend of British wool, hemp and flax fibres improves durability within the comfort layers. Natural fibres like these tend to hold their loft well over time.
Comfort Layer - Luxury Blend
Wool, mohair and cashmere sit here to deepen the indulgent feel. These are the fillings that give the surface its soft, expensive-feeling finish.
Comfort Layer - British Wool
Layers of British wool provide snug, cushioned comfort. Wool also regulates temperature naturally, which helps across the seasons.
Support Layer - Mini Pocket Springs
24,300 mini springs create many more points of contact with your body. That means comfort delivered exactly where you need it, with less of the hammocking a coarser spring layer can cause.
Support Layer - Cortec Quad Springs
700 of Harrison Spinks' award-winning Cortec Quad springs form the core, secured in groups of four within one fabric pocket. This grouped design gives responsive, stable support at the base of the mattress.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Warm sleepers
Moisture wicking cotton on the summer side and breathable hemp, flax and wool layers draw damp away, which means a cooler, drier feel on warm nights.
Side sleepers
The medium soft feel and 24,300 mini springs create many contact points, so shoulders and hips are cushioned precisely rather than pushed back.
Eco-conscious buyers
There is no foam in the layer list, just cotton, hemp, flax, British wool, mohair and cashmere, so the whole filling is natural.
Allergy sufferers
Natural fibres such as wool, cotton and hemp breathe and wick moisture, which means less of the clammy warmth that synthetic fillings can trap.
Combination sleepers
The 700 Cortec Quad springs in the core give responsive, stable support, while the soft surface stays comfortable as you move between positions.
If you prefer a firm surface or sleep mostly on your front, the soft to medium feel here is unlikely to give you the resistance you want. Budget shoppers should also pass: this is a serious outlay. And if you can't manage turning a heavy 32cm mattress, the seasonal turn design may prove awkward.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Harrison Spinks Diamond 25000 Pocket Mattress (Soft to Medium Feel)
Select a comparison article below or choose to compare this mattress side by side with up to 2 other mattresses.
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
How firm is the Harrison Spinks Diamond 25000?
It has a soft to medium feel. That gentle surface suits side sleepers and anyone who likes a cushioned, enveloping sleep position, although heavier sleepers or those who prefer a firmer platform may find it a little too yielding.
How many springs does the Diamond 25000 have?
The listing details 24,300 mini pocket springs in the support layers plus 700 Cortec Quad springs at the core, secured in groups of four within a single fabric pocket. That combination gives many small points of contact for precise pressure relief.
Does the Harrison Spinks Diamond 25000 come with a trial?
Mattress Online lists a 100-night trial and a 5-year guarantee for this mattress. Those are the retailer's own terms, so if you buy elsewhere, check that seller's trial and guarantee before ordering.
Do you need to flip the Harrison Spinks Diamond 25000?
The retailer's description presents it as double-sided with a seasonal turn design, including a summer side with moisture wicking cotton. The listing's specification table is contradictory on this point, so it's worth confirming with the retailer before you buy.
How much does delivery cost for the Diamond 25000?
Mattress Online offers free delivery within 7 weeks to the front door of your building across mainland England and most of Scotland, Wales and Northern Ireland. Delivery to your room of choice and old mattress recycling are both available for an extra charge.
Couldn't find an answer to your question? Send us a message